Moves webview_impl.cc, webframe_impl.cc and webframeloaderclient_impl.cc into

webkit/api/src.

R=yaar
BUG=25896,25897,25902
TEST=none

Review URL: http://codereview.chromium.org/341030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30558 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1890 insertions, 0 deletions

diff --git a/webkit/api/src/WebFrameImpl.cpp b/webkit/api/src/WebFrameImpl.cpp
new file mode 100644
index 0000000..617cfd5
--- /dev/null
+++ b/webkit/api/src/WebFrameImpl.cpp
@@ -0,0 +1,1890 @@
+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// How ownership works
+// -------------------
+//
+// Big oh represents a refcounted relationship: owner O--- ownee
+//
+// WebView (for the toplevel frame only)
+//    O
+//    |
+//   Page O------- Frame (m_mainFrame) O-------O FrameView
+//                   ||
+//                   ||
+//               FrameLoader O-------- WebFrame (via FrameLoaderClient)
+//
+// FrameLoader and Frame are formerly one object that was split apart because
+// it got too big. They basically have the same lifetime, hence the double line.
+//
+// WebFrame is refcounted and has one ref on behalf of the FrameLoader/Frame.
+// This is not a normal reference counted pointer because that would require
+// changing WebKit code that we don't control. Instead, it is created with this
+// ref initially and it is removed when the FrameLoader is getting destroyed.
+//
+// WebFrames are created in two places, first in WebViewImpl when the root
+// frame is created, and second in WebFrame::CreateChildFrame when sub-frames
+// are created. WebKit will hook up this object to the FrameLoader/Frame
+// and the refcount will be correct.
+//
+// How frames are destroyed
+// ------------------------
+//
+// The main frame is never destroyed and is re-used. The FrameLoader is re-used
+// and a reference to the main frame is kept by the Page.
+//
+// When frame content is replaced, all subframes are destroyed. This happens
+// in FrameLoader::detachFromParent for each subframe.
+//
+// Frame going away causes the FrameLoader to get deleted. In FrameLoader's
+// destructor, it notifies its client with frameLoaderDestroyed. This calls
+// WebFrame::Closing and then derefs the WebFrame and will cause it to be
+// deleted (unless an external someone is also holding a reference).
+
+#include "config.h"
+#include "WebFrameImpl.h"
+
+#include <algorithm>
+
+#include "Chrome.h"
+#include "ChromiumBridge.h"
+#include "ClipboardUtilitiesChromium.h"
+#include "Console.h"
+#include "Document.h"
+#include "DocumentFragment.h" // Only needed for ReplaceSelectionCommand.h :(
+#include "DocumentLoader.h"
+#include "DocumentMarker.h"
+#include "DOMWindow.h"
+#include "DOMUtilitiesPrivate.h"
+#include "Editor.h"
+#include "EventHandler.h"
+#include "FormState.h"
+#include "FrameChromium.h"
+#include "FrameLoader.h"
+#include "FrameLoadRequest.h"
+#include "FrameTree.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLCollection.h"
+#include "HTMLHeadElement.h"
+#include "HTMLInputElement.h"
+#include "HTMLFormElement.h"
+#include "HTMLFrameOwnerElement.h"
+#include "HTMLLinkElement.h"
+#include "HTMLNames.h"
+#include "HistoryItem.h"
+#include "InspectorController.h"
+#include "markup.h"
+#include "Page.h"
+#include "PasswordAutocompleteListener.h"
+#include "PlatformContextSkia.h"
+#include "PrintContext.h"
+#include "RenderFrame.h"
+#include "RenderView.h"
+#include "RenderWidget.h"
+#include "ReplaceSelectionCommand.h"
+#include "ResourceHandle.h"
+#include "ResourceRequest.h"
+#include "ScriptController.h"
+#include "ScriptSourceCode.h"
+#include "ScriptValue.h"
+#include "ScrollbarTheme.h"
+#include "ScrollTypes.h"
+#include "SelectionController.h"
+#include "Settings.h"
+#include "SkiaUtils.h"
+#include "SubstituteData.h"
+#include "TextIterator.h"
+#include "TextAffinity.h"
+#include "XPathResult.h"
+#include "WebConsoleMessage.h"
+#include "WebDataSourceImpl.h"
+#include "WebFindOptions.h"
+#include "WebForm.h"
+#include "WebFrameClient.h"
+#include "WebHistoryItem.h"
+#include "WebRange.h"
+#include "WebRect.h"
+#include "WebScriptSource.h"
+#include "WebSecurityOrigin.h"
+#include "WebSize.h"
+#include "WebURLError.h"
+#include "WebVector.h"
+#include "WebViewImpl.h"
+#include <wtf/CurrentTime.h>
+
+#if PLATFORM(DARWIN)
+#include "LocalCurrentGraphicsContext.h"
+#endif
+
+#if PLATFORM(LINUX)
+#include <gdk/gdk.h>
+#endif
+
+using namespace WebCore;
+
+namespace WebKit {
+
+// Key for a StatsCounter tracking how many WebFrames are active.
+static const char* const webFrameActiveCount = "WebFrameActiveCount";
+
+static const char* const osdType = "application/opensearchdescription+xml";
+static const char* const osdRel = "search";
+
+// Backend for contentAsPlainText, this is a recursive function that gets
+// the text for the current frame and all of its subframes. It will append
+// the text of each frame in turn to the |output| up to |maxChars| length.
+//
+// The |frame| must be non-null.
+static void frameContentAsPlainText(size_t maxChars, Frame* frame,
+                                    Vector<UChar>* output)
+{
+    Document* doc = frame->document();
+    if (!doc)
+        return;
+
+    if (!frame->view())
+        return;
+
+    // TextIterator iterates over the visual representation of the DOM. As such,
+    // it requires you to do a layout before using it (otherwise it'll crash).
+    if (frame->view()->needsLayout())
+        frame->view()->layout();
+
+    // Select the document body.
+    RefPtr<Range> range(doc->createRange());
+    ExceptionCode exception = 0;
+    range->selectNodeContents(doc->body(), exception);
+
+    if (exception == 0) {
+        // The text iterator will walk nodes giving us text. This is similar to
+        // the plainText() function in TextIterator.h, but we implement the maximum
+        // size and also copy the results directly into a wstring, avoiding the
+        // string conversion.
+        for (TextIterator it(range.get()); !it.atEnd(); it.advance()) {
+            const UChar* chars = it.characters();
+            if (!chars) {
+                if (it.length() != 0) {
+                    // It appears from crash reports that an iterator can get into a state
+                    // where the character count is nonempty but the character pointer is
+                    // null. advance()ing it will then just add that many to the null
+                    // pointer which won't be caught in a null check but will crash.
+                    //
+                    // A null pointer and 0 length is common for some nodes.
+                    //
+                    // IF YOU CATCH THIS IN A DEBUGGER please let brettw know. We don't
+                    // currently understand the conditions for this to occur. Ideally, the
+                    // iterators would never get into the condition so we should fix them
+                    // if we can.
+                    ASSERT_NOT_REACHED();
+                    break;
+                }
+
+                // Just got a null node, we can forge ahead!
+                continue;
+            }
+            size_t toAppend =
+                std::min(static_cast<size_t>(it.length()), maxChars - output->size());
+            output->append(chars, toAppend);
+            if (output->size() >= maxChars)
+                return; // Filled up the buffer.
+        }
+    }
+
+    // The separator between frames when the frames are converted to plain text.
+    const UChar frameSeparator[] = { '\n', '\n' };
+    const size_t frameSeparatorLen = 2;
+
+    // Recursively walk the children.
+    FrameTree* frameTree = frame->tree();
+    for (Frame* curChild = frameTree->firstChild(); curChild; curChild = curChild->tree()->nextSibling()) {
+        // Make sure the frame separator won't fill up the buffer, and give up if
+        // it will. The danger is if the separator will make the buffer longer than
+        // maxChars. This will cause the computation above:
+        //   maxChars - output->size()
+        // to be a negative number which will crash when the subframe is added.
+        if (output->size() >= maxChars - frameSeparatorLen)
+            return;
+
+        output->append(frameSeparator, frameSeparatorLen);
+        frameContentAsPlainText(maxChars, curChild, output);
+        if (output->size() >= maxChars)
+            return; // Filled up the buffer.
+    }
+}
+
+// Simple class to override some of PrintContext behavior.
+class ChromePrintContext : public PrintContext, public Noncopyable {
+public:
+    ChromePrintContext(Frame* frame)
+        : PrintContext(frame)
+        , m_printedPageWidth(0)
+    {
+    }
+
+    void begin(float width)
+    {
+        ASSERT(!m_printedPageWidth);
+        m_printedPageWidth = width;
+        PrintContext::begin(m_printedPageWidth);
+    }
+
+    float getPageShrink(int pageNumber) const
+    {
+        IntRect pageRect = m_pageRects[pageNumber];
+        return m_printedPageWidth / pageRect.width();
+    }
+
+    // Spools the printed page, a subrect of m_frame.  Skip the scale step.
+    // NativeTheme doesn't play well with scaling. Scaling is done browser side
+    // instead.  Returns the scale to be applied.
+    float spoolPage(GraphicsContext& ctx, int pageNumber)
+    {
+        IntRect pageRect = m_pageRects[pageNumber];
+        float scale = m_printedPageWidth / pageRect.width();
+
+        ctx.save();
+        ctx.translate(static_cast<float>(-pageRect.x()),
+                      static_cast<float>(-pageRect.y()));
+        ctx.clip(pageRect);
+        m_frame->view()->paintContents(&ctx, pageRect);
+        ctx.restore();
+        return scale;
+    }
+
+private:
+    // Set when printing.
+    float m_printedPageWidth;
+};
+
+static WebDataSource* DataSourceForDocLoader(DocumentLoader* loader)
+{
+    return loader ? WebDataSourceImpl::fromDocumentLoader(loader) : 0;
+}
+
+
+// WebFrame -------------------------------------------------------------------
+
+class WebFrameImpl::DeferredScopeStringMatches {
+public:
+    DeferredScopeStringMatches(WebFrameImpl* webFrame,
+                               int identifier,
+                               const WebString& searchText,
+                               const WebFindOptions& options,
+                               bool reset)
+        : m_timer(this, &DeferredScopeStringMatches::doTimeout)
+        , m_webFrame(webFrame)
+        , m_identifier(identifier)
+        , m_searchText(searchText)
+        , m_options(options)
+        , m_reset(reset)
+    {
+        m_timer.startOneShot(0.0);
+    }
+
+private:
+    void doTimeout(Timer<DeferredScopeStringMatches>*)
+    {
+        m_webFrame->callScopeStringMatches(
+            this, m_identifier, m_searchText, m_options, m_reset);
+    }
+
+    Timer<DeferredScopeStringMatches> m_timer;
+    RefPtr<WebFrameImpl> m_webFrame;
+    int m_identifier;
+    WebString m_searchText;
+    WebFindOptions m_options;
+    bool m_reset;
+};
+
+
+// WebFrame -------------------------------------------------------------------
+
+WebFrame* WebFrame::frameForEnteredContext()
+{
+    Frame* frame =
+        ScriptController::retrieveFrameForEnteredContext();
+    return WebFrameImpl::fromFrame(frame);
+}
+
+WebFrame* WebFrame::frameForCurrentContext()
+{
+    Frame* frame =
+        ScriptController::retrieveFrameForCurrentContext();
+    return WebFrameImpl::fromFrame(frame);
+}
+
+WebString WebFrameImpl::name() const
+{
+    return m_frame->tree()->name();
+}
+
+WebURL WebFrameImpl::url() const
+{
+    const WebDataSource* ds = dataSource();
+    if (!ds)
+        return WebURL();
+    return ds->request().url();
+}
+
+WebURL WebFrameImpl::favIconURL() const
+{
+    FrameLoader* frameLoader = m_frame->loader();
+    // The URL to the favicon may be in the header. As such, only
+    // ask the loader for the favicon if it's finished loading.
+    if (frameLoader->state() == FrameStateComplete) {
+        const KURL& url = frameLoader->iconURL();
+        if (!url.isEmpty())
+            return url;
+    }
+    return WebURL();
+}
+
+WebURL WebFrameImpl::openSearchDescriptionURL() const
+{
+    FrameLoader* frameLoader = m_frame->loader();
+    if (frameLoader->state() == FrameStateComplete
+        && m_frame->document() && m_frame->document()->head()
+        && !m_frame->tree()->parent()) {
+        HTMLHeadElement* head = m_frame->document()->head();
+        if (head) {
+            RefPtr<HTMLCollection> children = head->children();
+            for (Node* child = children->firstItem(); child != 0; child = children->nextItem()) {
+                HTMLLinkElement* linkElement = toHTMLLinkElement(child);
+                if (linkElement
+                    && linkElement->type() == osdType
+                    && linkElement->rel() == osdRel
+                    && !linkElement->href().isEmpty())
+                    return linkElement->href();
+            }
+        }
+    }
+    return WebURL();
+}
+
+WebSize WebFrameImpl::scrollOffset() const
+{
+    FrameView* view = frameView();
+    if (view)
+        return view->scrollOffset();
+
+    return WebSize();
+}
+
+WebSize WebFrameImpl::contentsSize() const
+{
+    return frame()->view()->contentsSize();
+}
+
+int WebFrameImpl::contentsPreferredWidth() const
+{
+    if ((m_frame->document() != 0) && (m_frame->document()->renderView() != 0))
+        return m_frame->document()->renderView()->minPrefWidth();
+
+    return 0;
+}
+
+bool WebFrameImpl::hasVisibleContent() const
+{
+    return frame()->view()->visibleWidth() > 0 && frame()->view()->visibleHeight() > 0;
+}
+
+WebView* WebFrameImpl::view() const
+{
+    return viewImpl();
+}
+
+WebFrame* WebFrameImpl::opener() const
+{
+    Frame* opener = 0;
+    if (m_frame)
+        opener = m_frame->loader()->opener();
+    return fromFrame(opener);
+}
+
+WebFrame* WebFrameImpl::parent() const
+{
+    Frame *parent = 0;
+    if (m_frame)
+        parent = m_frame->tree()->parent();
+    return fromFrame(parent);
+}
+
+WebFrame* WebFrameImpl::top() const
+{
+    if (m_frame)
+        return fromFrame(m_frame->tree()->top());
+
+    return 0;
+}
+
+WebFrame* WebFrameImpl::firstChild() const
+{
+    return fromFrame(frame()->tree()->firstChild());
+}
+
+WebFrame* WebFrameImpl::lastChild() const
+{
+    return fromFrame(frame()->tree()->lastChild());
+}
+
+WebFrame* WebFrameImpl::nextSibling() const
+{
+    return fromFrame(frame()->tree()->nextSibling());
+}
+
+WebFrame* WebFrameImpl::previousSibling() const
+{
+    return fromFrame(frame()->tree()->previousSibling());
+}
+
+WebFrame* WebFrameImpl::traverseNext(bool wrap) const
+{
+    return fromFrame(frame()->tree()->traverseNextWithWrap(wrap));
+}
+
+WebFrame* WebFrameImpl::traversePrevious(bool wrap) const
+{
+    return fromFrame(frame()->tree()->traversePreviousWithWrap(wrap));
+}
+
+WebFrame* WebFrameImpl::findChildByName(const WebString& name) const
+{
+    return fromFrame(frame()->tree()->child(name));
+}
+
+WebFrame* WebFrameImpl::findChildByExpression(const WebString& xpath) const
+{
+    if (xpath.isEmpty())
+        return 0;
+
+    Document* document = m_frame->document();
+
+    ExceptionCode ec = 0;
+    PassRefPtr<XPathResult> xpathResult =
+        document->evaluate(xpath,
+        document,
+        0, // namespace
+        XPathResult::ORDERED_NODE_ITERATOR_TYPE,
+        0, // XPathResult object
+        ec);
+    if (!xpathResult.get())
+        return 0;
+
+    Node* node = xpathResult->iterateNext(ec);
+
+    if (!node || !node->isFrameOwnerElement())
+        return 0;
+    HTMLFrameOwnerElement* frameElement =
+        static_cast<HTMLFrameOwnerElement*>(node);
+    return fromFrame(frameElement->contentFrame());
+}
+
+void WebFrameImpl::forms(WebVector<WebForm>& results) const
+{
+    if (!m_frame)
+        return;
+
+    RefPtr<HTMLCollection> forms = m_frame->document()->forms();
+    size_t formCount = forms->length();
+
+    WebVector<WebForm> temp(formCount);
+    for (size_t i = 0; i < formCount; ++i) {
+        Node* node = forms->item(i);
+        // Strange but true, sometimes item can be 0.
+        if (node)
+            temp[i] = static_cast<HTMLFormElement*>(node);
+    }
+    results.swap(temp);
+}
+
+WebSecurityOrigin WebFrameImpl::securityOrigin() const
+{
+    if (!m_frame || !m_frame->document())
+        return WebSecurityOrigin();
+
+    return WebSecurityOrigin(m_frame->document()->securityOrigin());
+}
+
+void WebFrameImpl::grantUniversalAccess()
+{
+    ASSERT(m_frame && m_frame->document());
+    if (m_frame && m_frame->document())
+        m_frame->document()->securityOrigin()->grantUniversalAccess();
+}
+
+NPObject* WebFrameImpl::windowObject() const
+{
+    if (!m_frame)
+        return 0;
+
+    return m_frame->script()->windowScriptNPObject();
+}
+
+void WebFrameImpl::bindToWindowObject(const WebString& name, NPObject* object)
+{
+    ASSERT(m_frame);
+    if (!m_frame || !m_frame->script()->isEnabled())
+        return;
+
+    String key = name;
+#if USE(V8)
+    m_frame->script()->bindToWindowObject(m_frame, key, object);
+#else
+    notImplemented();
+#endif
+}
+
+void WebFrameImpl::executeScript(const WebScriptSource& source)
+{
+    m_frame->script()->executeScript(
+        ScriptSourceCode(source.code, source.url, source.startLine));
+}
+
+void WebFrameImpl::executeScriptInNewContext(
+    const WebScriptSource* sourcesIn, unsigned numSources, int extensionGroup)
+{
+    Vector<ScriptSourceCode> sources;
+
+    for (unsigned i = 0; i < numSources; ++i) {
+        sources.append(ScriptSourceCode(
+            sourcesIn[i].code, sourcesIn[i].url, sourcesIn[i].startLine));
+    }
+
+    m_frame->script()->evaluateInNewContext(sources, extensionGroup);
+}
+
+void WebFrameImpl::executeScriptInIsolatedWorld(
+    int worldId, const WebScriptSource* sourcesIn, unsigned numSources,
+    int extensionGroup)
+{
+    Vector<ScriptSourceCode> sources;
+
+    for (unsigned i = 0; i < numSources; ++i) {
+        sources.append(ScriptSourceCode(
+            sourcesIn[i].code, sourcesIn[i].url, sourcesIn[i].startLine));
+    }
+
+    m_frame->script()->evaluateInIsolatedWorld(worldId, sources, extensionGroup);
+}
+
+void WebFrameImpl::addMessageToConsole(const WebConsoleMessage& message)
+{
+    ASSERT(frame());
+
+    MessageLevel webCoreMessageLevel;
+    switch (message.level) {
+    case WebConsoleMessage::LevelTip:
+        webCoreMessageLevel = TipMessageLevel;
+        break;
+    case WebConsoleMessage::LevelLog:
+        webCoreMessageLevel = LogMessageLevel;
+        break;
+    case WebConsoleMessage::LevelWarning:
+        webCoreMessageLevel = WarningMessageLevel;
+        break;
+    case WebConsoleMessage::LevelError:
+        webCoreMessageLevel = ErrorMessageLevel;
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+        return;
+    }
+
+    frame()->domWindow()->console()->addMessage(
+        OtherMessageSource, LogMessageType, webCoreMessageLevel, message.text,
+        1, String());
+}
+
+void WebFrameImpl::collectGarbage()
+{
+    if (!m_frame)
+        return;
+    if (!m_frame->settings()->isJavaScriptEnabled())
+        return;
+    // FIXME: Move this to the ScriptController and make it JS neutral.
+#if USE(V8)
+    m_frame->script()->collectGarbage();
+#else
+    notImplemented();
+#endif
+}
+
+#if USE(V8)
+// Returns the V8 context for this frame, or an empty handle if there is none.
+v8::Local<v8::Context> WebFrameImpl::mainWorldScriptContext() const
+{
+    if (!m_frame)
+        return v8::Local<v8::Context>();
+
+    return V8Proxy::mainWorldContext(m_frame);
+}
+#endif
+
+bool WebFrameImpl::insertStyleText(
+    const WebString& css, const WebString& id) {
+    Document* document = frame()->document();
+    if (!document)
+        return false;
+    Element* documentElement = document->documentElement();
+    if (!documentElement)
+        return false;
+
+    ExceptionCode err = 0;
+
+    if (!id.isEmpty()) {
+        Element* oldElement = document->getElementById(id);
+        if (oldElement) {
+            Node* parent = oldElement->parent();
+            if (!parent)
+                return false;
+            parent->removeChild(oldElement, err);
+        }
+    }
+
+    RefPtr<Element> stylesheet = document->createElement(
+        HTMLNames::styleTag, false);
+    if (!id.isEmpty())
+        stylesheet->setAttribute(HTMLNames::idAttr, id);
+    stylesheet->setTextContent(css, err);
+    ASSERT(!err);
+    Node* first = documentElement->firstChild();
+    bool success = documentElement->insertBefore(stylesheet, first, err);
+    ASSERT(success);
+    return success;
+}
+
+void WebFrameImpl::reload()
+{
+    m_frame->loader()->history()->saveDocumentAndScrollState();
+
+    stopLoading();  // Make sure existing activity stops.
+    m_frame->loader()->reload();
+}
+
+void WebFrameImpl::loadRequest(const WebURLRequest& request)
+{
+    ASSERT(!request.isNull());
+    const ResourceRequest& resourceRequest = request.toResourceRequest();
+
+    if (resourceRequest.url().protocolIs("javascript")) {
+        loadJavaScriptURL(resourceRequest.url());
+        return;
+    }
+
+    stopLoading();  // Make sure existing activity stops.
+    m_frame->loader()->load(resourceRequest, false);
+}
+
+void WebFrameImpl::loadHistoryItem(const WebHistoryItem& item)
+{
+    RefPtr<HistoryItem> historyItem = PassRefPtr<HistoryItem>(item);
+    ASSERT(historyItem.get());
+
+    stopLoading();  // Make sure existing activity stops.
+
+    // If there is no currentItem, which happens when we are navigating in
+    // session history after a crash, we need to manufacture one otherwise WebKit
+    // hoarks. This is probably the wrong thing to do, but it seems to work.
+    RefPtr<HistoryItem> currentItem = m_frame->loader()->history()->currentItem();
+    if (!currentItem) {
+        currentItem = HistoryItem::create();
+        currentItem->setLastVisitWasFailure(true);
+        m_frame->loader()->history()->setCurrentItem(currentItem.get());
+        viewImpl()->setCurrentHistoryItem(currentItem.get());
+    }
+
+    m_frame->loader()->history()->goToItem(
+        historyItem.get(), FrameLoadTypeIndexedBackForward);
+}
+
+void WebFrameImpl::loadData(const WebData& data,
+                            const WebString& mimeType,
+                            const WebString& textEncoding,
+                            const WebURL& baseURL,
+                            const WebURL& unreachableURL,
+                            bool replace)
+{
+    SubstituteData substData(data, mimeType, textEncoding, unreachableURL);
+    ASSERT(substData.isValid());
+
+    stopLoading();  // Make sure existing activity stops.
+    m_frame->loader()->load(ResourceRequest(baseURL), substData, false);
+    if (replace) {
+        // Do this to force WebKit to treat the load as replacing the currently
+        // loaded page.
+        m_frame->loader()->setReplacing();
+    }
+}
+
+void WebFrameImpl::loadHTMLString(const WebData& data,
+                                  const WebURL& baseURL,
+                                  const WebURL& unreachableURL,
+                                  bool replace)
+{
+    loadData(data,
+             WebString::fromUTF8("text/html"),
+             WebString::fromUTF8("UTF-8"),
+             baseURL,
+             unreachableURL,
+             replace);
+}
+
+bool WebFrameImpl::isLoading() const
+{
+    if (!m_frame)
+        return false;
+    return m_frame->loader()->isLoading();
+}
+
+void WebFrameImpl::stopLoading()
+{
+    if (!m_frame)
+      return;
+
+    // FIXME: Figure out what we should really do here.  It seems like a bug
+    // that FrameLoader::stopLoading doesn't call stopAllLoaders.
+    m_frame->loader()->stopAllLoaders();
+    m_frame->loader()->stopLoading(UnloadEventPolicyNone);
+}
+
+WebDataSource* WebFrameImpl::provisionalDataSource() const
+{
+    FrameLoader* frameLoader = m_frame->loader();
+
+    // We regard the policy document loader as still provisional.
+    DocumentLoader* docLoader = frameLoader->provisionalDocumentLoader();
+    if (!docLoader)
+        docLoader = frameLoader->policyDocumentLoader();
+
+    return DataSourceForDocLoader(docLoader);
+}
+
+WebDataSource* WebFrameImpl::dataSource() const
+{
+    return DataSourceForDocLoader(m_frame->loader()->documentLoader());
+}
+
+WebHistoryItem WebFrameImpl::previousHistoryItem() const
+{
+    // We use the previous item here because documentState (filled-out forms)
+    // only get saved to history when it becomes the previous item.  The caller
+    // is expected to query the history item after a navigation occurs, after
+    // the desired history item has become the previous entry.
+    return WebHistoryItem(viewImpl()->previousHistoryItem());
+}
+
+WebHistoryItem WebFrameImpl::currentHistoryItem() const
+{
+    m_frame->loader()->history()->saveDocumentAndScrollState();
+
+    return WebHistoryItem(m_frame->page()->backForwardList()->currentItem());
+}
+
+void WebFrameImpl::enableViewSourceMode(bool enable)
+{
+    if (m_frame)
+        m_frame->setInViewSourceMode(enable);
+}
+
+bool WebFrameImpl::isViewSourceModeEnabled() const
+{
+    if (m_frame)
+        return m_frame->inViewSourceMode();
+
+    return false;
+}
+
+void WebFrameImpl::setReferrerForRequest(
+    WebURLRequest& request, const WebURL& referrerURL) {
+    String referrer;
+    if (referrerURL.isEmpty())
+        referrer = m_frame->loader()->outgoingReferrer();
+    else
+        referrer = referrerURL.spec().utf16();
+    if (SecurityOrigin::shouldHideReferrer(request.url(), referrer))
+        return;
+    request.setHTTPHeaderField(WebString::fromUTF8("Referer"), referrer);
+}
+
+void WebFrameImpl::dispatchWillSendRequest(WebURLRequest& request)
+{
+    ResourceResponse response;
+    m_frame->loader()->client()->dispatchWillSendRequest(
+        0, 0, request.toMutableResourceRequest(), response);
+}
+
+void WebFrameImpl::commitDocumentData(const char* data, size_t dataLen)
+{
+    DocumentLoader* documentLoader = m_frame->loader()->documentLoader();
+
+    // Set the text encoding.  This calls begin() for us.  It is safe to call
+    // this multiple times (Mac does: page/mac/WebCoreFrameBridge.mm).
+    bool userChosen = true;
+    String encoding = documentLoader->overrideEncoding();
+    if (encoding.isNull()) {
+        userChosen = false;
+        encoding = documentLoader->response().textEncodingName();
+    }
+    m_frame->loader()->setEncoding(encoding, userChosen);
+
+    // NOTE: mac only does this if there is a document
+    m_frame->loader()->addData(data, dataLen);
+}
+
+unsigned WebFrameImpl::unloadListenerCount() const
+{
+    return frame()->domWindow()->pendingUnloadEventListeners();
+}
+
+bool WebFrameImpl::isProcessingUserGesture() const
+{
+    return frame()->loader()->isProcessingUserGesture();
+}
+
+bool WebFrameImpl::willSuppressOpenerInNewFrame() const
+{
+    return frame()->loader()->suppressOpenerInNewFrame();
+}
+
+void WebFrameImpl::replaceSelection(const WebString& text)
+{
+    RefPtr<DocumentFragment> fragment = createFragmentFromText(
+        frame()->selection()->toNormalizedRange().get(), text);
+    applyCommand(ReplaceSelectionCommand::create(
+        frame()->document(), fragment.get(), false, true, true));
+}
+
+void WebFrameImpl::insertText(const WebString& text)
+{
+    frame()->editor()->insertText(text, 0);
+}
+
+void WebFrameImpl::setMarkedText(
+    const WebString& text, unsigned location, unsigned length)
+{
+    Editor* editor = frame()->editor();
+
+    editor->confirmComposition(text);
+
+    Vector<CompositionUnderline> decorations;
+    editor->setComposition(text, decorations, location, length);
+}
+
+void WebFrameImpl::unmarkText()
+{
+    frame()->editor()->confirmCompositionWithoutDisturbingSelection();
+}
+
+bool WebFrameImpl::hasMarkedText() const
+{
+    return frame()->editor()->hasComposition();
+}
+
+WebRange WebFrameImpl::markedRange() const
+{
+    return frame()->editor()->compositionRange();
+}
+
+bool WebFrameImpl::executeCommand(const WebString& name)
+{
+    ASSERT(frame());
+
+    if (name.length() <= 2)
+        return false;
+
+    // Since we don't have NSControl, we will convert the format of command
+    // string and call the function on Editor directly.
+    String command = name;
+
+    // Make sure the first letter is upper case.
+    command.replace(0, 1, command.substring(0, 1).upper());
+
+    // Remove the trailing ':' if existing.
+    if (command[command.length() - 1] == UChar(':'))
+        command = command.substring(0, command.length() - 1);
+
+    bool rv = true;
+
+    // Specially handling commands that Editor::execCommand does not directly
+    // support.
+    if (command == "DeleteToEndOfParagraph") {
+        Editor* editor = frame()->editor();
+        if (!editor->deleteWithDirection(SelectionController::FORWARD,
+                                         ParagraphBoundary,
+                                         true,
+                                         false)) {
+            editor->deleteWithDirection(SelectionController::FORWARD,
+                                        CharacterGranularity,
+                                        true,
+                                        false);
+        }
+    } else if (command == "Indent")
+        frame()->editor()->indent();
+    else if (command == "Outdent")
+        frame()->editor()->outdent();
+    else if (command == "DeleteBackward")
+        rv = frame()->editor()->command(AtomicString("BackwardDelete")).execute();
+    else if (command == "DeleteForward")
+        rv = frame()->editor()->command(AtomicString("ForwardDelete")).execute();
+    else if (command == "AdvanceToNextMisspelling") {
+        // False must be passed here, or the currently selected word will never be
+        // skipped.
+        frame()->editor()->advanceToNextMisspelling(false);
+    } else if (command == "ToggleSpellPanel")
+        frame()->editor()->showSpellingGuessPanel();
+    else
+        rv = frame()->editor()->command(command).execute();
+    return rv;
+}
+
+bool WebFrameImpl::executeCommand(const WebString& name, const WebString& value)
+{
+    ASSERT(frame());
+    String webName = name;
+
+    // moveToBeginningOfDocument and moveToEndfDocument are only handled by WebKit
+    // for editable nodes.
+    if (!frame()->editor()->canEdit() && webName == "moveToBeginningOfDocument")
+        return viewImpl()->propagateScroll(ScrollUp, ScrollByDocument);
+
+    if (!frame()->editor()->canEdit() && webName == "moveToEndOfDocument")
+        return viewImpl()->propagateScroll(ScrollDown, ScrollByDocument);
+
+    return frame()->editor()->command(webName).execute(value);
+}
+
+bool WebFrameImpl::isCommandEnabled(const WebString& name) const
+{
+    ASSERT(frame());
+    return frame()->editor()->command(name).isEnabled();
+}
+
+void WebFrameImpl::enableContinuousSpellChecking(bool enable)
+{
+    if (enable == isContinuousSpellCheckingEnabled())
+        return;
+    frame()->editor()->toggleContinuousSpellChecking();
+}
+
+bool WebFrameImpl::isContinuousSpellCheckingEnabled() const
+{
+    return frame()->editor()->isContinuousSpellCheckingEnabled();
+}
+
+bool WebFrameImpl::hasSelection() const
+{
+    // frame()->selection()->isNone() never returns true.
+    return (frame()->selection()->start() != frame()->selection()->end());
+}
+
+WebRange WebFrameImpl::selectionRange() const
+{
+    return frame()->selection()->toNormalizedRange();
+}
+
+WebString WebFrameImpl::selectionAsText() const
+{
+    RefPtr<Range> range = frame()->selection()->toNormalizedRange();
+    if (!range.get())
+        return WebString();
+
+    String text = range->text();
+#if PLATFORM(WIN_OS)
+    replaceNewlinesWithWindowsStyleNewlines(text);
+#endif
+    replaceNBSPWithSpace(text);
+    return text;
+}
+
+WebString WebFrameImpl::selectionAsMarkup() const
+{
+    RefPtr<Range> range = frame()->selection()->toNormalizedRange();
+    if (!range.get())
+        return WebString();
+
+    return createMarkup(range.get(), 0);
+}
+
+int WebFrameImpl::printBegin(const WebSize& pageSize)
+{
+    ASSERT(!frame()->document()->isFrameSet());
+
+    m_printContext.set(new ChromePrintContext(frame()));
+    FloatRect rect(0, 0, static_cast<float>(pageSize.width),
+                         static_cast<float>(pageSize.height));
+    m_printContext->begin(rect.width());
+    float pageHeight;
+    // We ignore the overlays calculation for now since they are generated in the
+    // browser. pageHeight is actually an output parameter.
+    m_printContext->computePageRects(rect, 0, 0, 1.0, pageHeight);
+    return m_printContext->pageCount();
+}
+
+float WebFrameImpl::getPrintPageShrink(int page)
+{
+    // Ensure correct state.
+    if (!m_printContext.get() || page < 0) {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+
+    return m_printContext->getPageShrink(page);
+}
+
+float WebFrameImpl::printPage(int page, WebCanvas* canvas)
+{
+    // Ensure correct state.
+    if (!m_printContext.get() || page < 0 || !frame() || !frame()->document()) {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+
+#if PLATFORM(WIN_OS) || PLATFORM(LINUX) || PLATFORM(FREEBSD)
+    PlatformContextSkia context(canvas);
+    GraphicsContext spool(&context);
+#elif PLATFORM(DARWIN)
+    GraphicsContext spool(canvas);
+    LocalCurrentGraphicsContext localContext(&spool);
+#endif
+
+    return m_printContext->spoolPage(spool, page);
+}
+
+void WebFrameImpl::printEnd()
+{
+    ASSERT(m_printContext.get());
+    if (m_printContext.get())
+        m_printContext->end();
+    m_printContext.clear();
+}
+
+bool WebFrameImpl::find(int identifier,
+                        const WebString& searchText,
+                        const WebFindOptions& options,
+                        bool wrapWithinFrame,
+                        WebRect* selectionRect)
+{
+    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
+
+    if (!options.findNext)
+        frame()->page()->unmarkAllTextMatches();
+    else
+        setMarkerActive(m_activeMatch.get(), false);  // Active match is changing.
+
+    // Starts the search from the current selection.
+    bool startInSelection = true;
+
+    // If the user has selected something since the last Find operation we want
+    // to start from there. Otherwise, we start searching from where the last Find
+    // operation left off (either a Find or a FindNext operation).
+    VisibleSelection selection(frame()->selection()->selection());
+    if (selection.isNone() && m_activeMatch) {
+        selection = VisibleSelection(m_activeMatch.get());
+        frame()->selection()->setSelection(selection);
+    }
+
+    ASSERT(frame() && frame()->view());
+    bool found = frame()->findString(
+        searchText, options.forward, options.matchCase, wrapWithinFrame,
+        startInSelection);
+    if (found) {
+        // Store which frame was active. This will come in handy later when we
+        // change the active match ordinal below.
+        WebFrameImpl* oldActiveFrame = mainFrameImpl->m_activeMatchFrame;
+        // Set this frame as the active frame (the one with the active highlight).
+        mainFrameImpl->m_activeMatchFrame = this;
+
+        // We found something, so we can now query the selection for its position.
+        VisibleSelection newSelection(frame()->selection()->selection());
+        IntRect currSelectionRect;
+
+        // If we thought we found something, but it couldn't be selected (perhaps
+        // because it was marked -webkit-user-select: none), we can't set it to
+        // be active but we still continue searching. This matches Safari's
+        // behavior, including some oddities when selectable and un-selectable text
+        // are mixed on a page: see https://bugs.webkit.org/show_bug.cgi?id=19127.
+        if (newSelection.isNone() || (newSelection.start() == newSelection.end()))
+            m_activeMatch = 0;
+        else {
+            m_activeMatch = newSelection.toNormalizedRange();
+            currSelectionRect = m_activeMatch->boundingBox();
+            setMarkerActive(m_activeMatch.get(), true);  // Active.
+            // WebKit draws the highlighting for all matches.
+            executeCommand(WebString::fromUTF8("Unselect"));
+        }
+
+        if (!options.findNext) {
+            // This is a Find operation, so we set the flag to ask the scoping effort
+            // to find the active rect for us so we can update the ordinal (n of m).
+            m_locatingActiveRect = true;
+        } else {
+            if (oldActiveFrame != this) {
+                // If the active frame has changed it means that we have a multi-frame
+                // page and we just switch to searching in a new frame. Then we just
+                // want to reset the index.
+                if (options.forward)
+                    m_activeMatchIndex = 0;
+                else
+                    m_activeMatchIndex = m_lastMatchCount - 1;
+            } else {
+                // We are still the active frame, so increment (or decrement) the
+                // |m_activeMatchIndex|, wrapping if needed (on single frame pages).
+                options.forward ? ++m_activeMatchIndex : --m_activeMatchIndex;
+                if (m_activeMatchIndex + 1 > m_lastMatchCount)
+                    m_activeMatchIndex = 0;
+                if (m_activeMatchIndex + 1 == 0)
+                    m_activeMatchIndex = m_lastMatchCount - 1;
+            }
+            if (selectionRect) {
+                WebRect rect = frame()->view()->convertToContainingWindow(currSelectionRect);
+                rect.x -= frameView()->scrollOffset().width();
+                rect.y -= frameView()->scrollOffset().height();
+                *selectionRect = rect;
+
+                reportFindInPageSelection(rect, m_activeMatchIndex + 1, identifier);
+            }
+        }
+    } else {
+        // Nothing was found in this frame.
+        m_activeMatch = 0;
+
+        // Erase all previous tickmarks and highlighting.
+        invalidateArea(InvalidateAll);
+    }
+
+    return found;
+}
+
+void WebFrameImpl::stopFinding(bool clearSelection)
+{
+    if (!clearSelection)
+        setFindEndstateFocusAndSelection();
+    cancelPendingScopingEffort();
+
+    // Remove all markers for matches found and turn off the highlighting.
+    if (!parent())
+        frame()->document()->removeMarkers(DocumentMarker::TextMatch);
+    frame()->setMarkedTextMatchesAreHighlighted(false);
+
+    // Let the frame know that we don't want tickmarks or highlighting anymore.
+    invalidateArea(InvalidateAll);
+}
+
+void WebFrameImpl::scopeStringMatches(int identifier,
+                                      const WebString& searchText,
+                                      const WebFindOptions& options,
+                                      bool reset)
+{
+    if (!shouldScopeMatches(searchText))
+        return;
+
+    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
+
+    if (reset) {
+        // This is a brand new search, so we need to reset everything.
+        // Scoping is just about to begin.
+        m_scopingComplete = false;
+        // Clear highlighting for this frame.
+        if (frame()->markedTextMatchesAreHighlighted())
+            frame()->page()->unmarkAllTextMatches();
+        // Clear the counters from last operation.
+        m_lastMatchCount = 0;
+        m_nextInvalidateAfter = 0;
+
+        m_resumeScopingFromRange = 0;
+
+        mainFrameImpl->m_framesScopingCount++;
+
+        // Now, defer scoping until later to allow find operation to finish quickly.
+        scopeStringMatchesSoon(
+            identifier,
+            searchText,
+            options,
+            false);  // false=we just reset, so don't do it again.
+        return;
+    }
+
+    RefPtr<Range> searchRange(rangeOfContents(frame()->document()));
+
+    ExceptionCode ec = 0, ec2 = 0;
+    if (m_resumeScopingFromRange.get()) {
+        // This is a continuation of a scoping operation that timed out and didn't
+        // complete last time around, so we should start from where we left off.
+        searchRange->setStart(m_resumeScopingFromRange->startContainer(),
+                              m_resumeScopingFromRange->startOffset(ec2) + 1,
+                              ec);
+        if (ec != 0 || ec2 != 0) {
+            if (ec2 != 0)  // A non-zero |ec| happens when navigating during search.
+                ASSERT_NOT_REACHED();
+            return;
+        }
+    }
+
+    // This timeout controls how long we scope before releasing control.  This
+    // value does not prevent us from running for longer than this, but it is
+    // periodically checked to see if we have exceeded our allocated time.
+    const double maxScopingDuration = 0.1;  // seconds
+
+    int matchCount = 0;
+    bool timedOut = false;
+    double startTime = currentTime();
+    do {
+        // Find next occurrence of the search string.
+        // FIXME: (http://b/1088245) This WebKit operation may run for longer
+        // than the timeout value, and is not interruptible as it is currently
+        // written. We may need to rewrite it with interruptibility in mind, or
+        // find an alternative.
+        RefPtr<Range> resultRange(findPlainText(searchRange.get(),
+                                                searchText,
+                                                true,
+                                                options.matchCase));
+        if (resultRange->collapsed(ec)) {
+            if (!resultRange->startContainer()->isInShadowTree())
+                break;
+
+            searchRange = rangeOfContents(frame()->document());
+            searchRange->setStartAfter(
+                resultRange->startContainer()->shadowAncestorNode(), ec);
+            continue;
+        }
+
+        // A non-collapsed result range can in some funky whitespace cases still not
+        // advance the range's start position (4509328). Break to avoid infinite
+        // loop. (This function is based on the implementation of
+        // Frame::markAllMatchesForText, which is where this safeguard comes from).
+        VisiblePosition newStart = endVisiblePosition(resultRange.get(), DOWNSTREAM);
+        if (newStart == startVisiblePosition(searchRange.get(), DOWNSTREAM))
+            break;
+
+        // Only treat the result as a match if it is visible
+        if (frame()->editor()->insideVisibleArea(resultRange.get())) {
+            ++matchCount;
+
+            setStart(searchRange.get(), newStart);
+            Node* shadowTreeRoot = searchRange->shadowTreeRootNode();
+            if (searchRange->collapsed(ec) && shadowTreeRoot)
+                searchRange->setEnd(shadowTreeRoot, shadowTreeRoot->childNodeCount(), ec);
+
+            // Catch a special case where Find found something but doesn't know what
+            // the bounding box for it is. In this case we set the first match we find
+            // as the active rect.
+            IntRect resultBounds = resultRange->boundingBox();
+            IntRect activeSelectionRect;
+            if (m_locatingActiveRect) {
+                activeSelectionRect = m_activeMatch.get() ?
+                    m_activeMatch->boundingBox() : resultBounds;
+            }
+
+            // If the Find function found a match it will have stored where the
+            // match was found in m_activeSelectionRect on the current frame. If we
+            // find this rect during scoping it means we have found the active
+            // tickmark.
+            bool foundActiveMatch = false;
+            if (m_locatingActiveRect && (activeSelectionRect == resultBounds)) {
+                // We have found the active tickmark frame.
+                mainFrameImpl->m_activeMatchFrame = this;
+                foundActiveMatch = true;
+                // We also know which tickmark is active now.
+                m_activeMatchIndex = matchCount - 1;
+                // To stop looking for the active tickmark, we set this flag.
+                m_locatingActiveRect = false;
+
+                // Notify browser of new location for the selected rectangle.
+                resultBounds.move(-frameView()->scrollOffset().width(),
+                                  -frameView()->scrollOffset().height());
+                reportFindInPageSelection(
+                    frame()->view()->convertToContainingWindow(resultBounds),
+                    m_activeMatchIndex + 1,
+                    identifier);
+            }
+
+            addMarker(resultRange.get(), foundActiveMatch);
+        }
+
+        m_resumeScopingFromRange = resultRange;
+        timedOut = (currentTime() - startTime) >= maxScopingDuration;
+    } while (!timedOut);
+
+    // Remember what we search for last time, so we can skip searching if more
+    // letters are added to the search string (and last outcome was 0).
+    m_lastSearchString = searchText;
+
+    if (matchCount > 0) {
+        frame()->setMarkedTextMatchesAreHighlighted(true);
+
+        m_lastMatchCount += matchCount;
+
+        // Let the mainframe know how much we found during this pass.
+        mainFrameImpl->increaseMatchCount(matchCount, identifier);
+    }
+
+    if (timedOut) {
+        // If we found anything during this pass, we should redraw. However, we
+        // don't want to spam too much if the page is extremely long, so if we
+        // reach a certain point we start throttling the redraw requests.
+        if (matchCount > 0)
+            invalidateIfNecessary();
+
+        // Scoping effort ran out of time, lets ask for another time-slice.
+        scopeStringMatchesSoon(
+            identifier,
+            searchText,
+            options,
+            false);  // don't reset.
+        return;  // Done for now, resume work later.
+    }
+
+    // This frame has no further scoping left, so it is done. Other frames might,
+    // of course, continue to scope matches.
+    m_scopingComplete = true;
+    mainFrameImpl->m_framesScopingCount--;
+
+    // If this is the last frame to finish scoping we need to trigger the final
+    // update to be sent.
+    if (mainFrameImpl->m_framesScopingCount == 0)
+        mainFrameImpl->increaseMatchCount(0, identifier);
+
+    // This frame is done, so show any scrollbar tickmarks we haven't drawn yet.
+    invalidateArea(InvalidateScrollbar);
+}
+
+void WebFrameImpl::cancelPendingScopingEffort()
+{
+    deleteAllValues(m_deferredScopingWork);
+    m_deferredScopingWork.clear();
+
+    m_activeMatchIndex = -1;
+}
+
+void WebFrameImpl::increaseMatchCount(int count, int identifier)
+{
+    // This function should only be called on the mainframe.
+    ASSERT(!parent());
+
+    m_totalMatchCount += count;
+
+    // Update the UI with the latest findings.
+    if (client()) {
+        client()->reportFindInPageMatchCount(identifier, m_totalMatchCount,
+                                             m_framesScopingCount == 0);
+    }
+}
+
+void WebFrameImpl::reportFindInPageSelection(const WebRect& selectionRect,
+                                             int activeMatchOrdinal,
+                                             int identifier)
+{
+    // Update the UI with the latest selection rect.
+    if (client()) {
+        client()->reportFindInPageSelection(
+            identifier, ordinalOfFirstMatchForFrame(this) + activeMatchOrdinal,
+            selectionRect);
+    }
+}
+
+void WebFrameImpl::resetMatchCount()
+{
+    m_totalMatchCount = 0;
+    m_framesScopingCount = 0;
+}
+
+WebURL WebFrameImpl::completeURL(const WebString& url) const
+{
+    if (!m_frame || !m_frame->document())
+        return WebURL();
+
+    return m_frame->document()->completeURL(url);
+}
+
+WebString WebFrameImpl::contentAsText(size_t maxChars) const
+{
+    if (!m_frame)
+        return WebString();
+
+    Vector<UChar> text;
+    frameContentAsPlainText(maxChars, m_frame, &text);
+    return String::adopt(text);
+}
+
+WebString WebFrameImpl::contentAsMarkup() const
+{
+    return createFullMarkup(m_frame->document());
+}
+
+// WebFrameImpl public ---------------------------------------------------------
+
+int WebFrameImpl::m_liveObjectCount = 0;
+
+PassRefPtr<WebFrameImpl> WebFrameImpl::create(WebFrameClient* client)
+{
+    return adoptRef(new WebFrameImpl(ClientHandle::create(client)));
+}
+
+WebFrameImpl::WebFrameImpl(PassRefPtr<ClientHandle> clientHandle)
+    : m_frameLoaderClient(this)
+    , m_clientHandle(clientHandle)
+    , m_activeMatchFrame(0)
+    , m_activeMatchIndex(-1)
+    , m_locatingActiveRect(false)
+    , m_resumeScopingFromRange(0)
+    , m_lastMatchCount(-1)
+    , m_totalMatchCount(-1)
+    , m_framesScopingCount(-1)
+    , m_scopingComplete(false)
+    , m_nextInvalidateAfter(0)
+{
+    ChromiumBridge::incrementStatsCounter(webFrameActiveCount);
+    m_liveObjectCount++;
+}
+
+WebFrameImpl::~WebFrameImpl()
+{
+    ChromiumBridge::decrementStatsCounter(webFrameActiveCount);
+    m_liveObjectCount--;
+
+    cancelPendingScopingEffort();
+    clearPasswordListeners();
+}
+
+void WebFrameImpl::initializeAsMainFrame(WebViewImpl* webViewImpl)
+{
+    RefPtr<Frame> frame = Frame::create(webViewImpl->page(), 0, &m_frameLoaderClient);
+    m_frame = frame.get();
+
+    // Add reference on behalf of FrameLoader.  See comments in
+    // WebFrameLoaderClient::frameLoaderDestroyed for more info.
+    ref();
+
+    // We must call init() after m_frame is assigned because it is referenced
+    // during init().
+    m_frame->init();
+}
+
+PassRefPtr<Frame> WebFrameImpl::createChildFrame(
+    const FrameLoadRequest& request, HTMLFrameOwnerElement* ownerElement)
+{
+    RefPtr<WebFrameImpl> webframe(adoptRef(new WebFrameImpl(m_clientHandle)));
+
+    // Add an extra ref on behalf of the Frame/FrameLoader, which references the
+    // WebFrame via the FrameLoaderClient interface. See the comment at the top
+    // of this file for more info.
+    webframe->ref();
+
+    RefPtr<Frame> childFrame = Frame::create(
+        m_frame->page(), ownerElement, &webframe->m_frameLoaderClient);
+    webframe->m_frame = childFrame.get();
+
+    childFrame->tree()->setName(request.frameName());
+
+    m_frame->tree()->appendChild(childFrame);
+
+    // Frame::init() can trigger onload event in the parent frame,
+    // which may detach this frame and trigger a null-pointer access
+    // in FrameTree::removeChild. Move init() after appendChild call
+    // so that webframe->mFrame is in the tree before triggering
+    // onload event handler.
+    // Because the event handler may set webframe->mFrame to null,
+    // it is necessary to check the value after calling init() and
+    // return without loading URL.
+    // (b:791612)
+    childFrame->init();      // create an empty document
+    if (!childFrame->tree()->parent())
+        return 0;
+
+    m_frame->loader()->loadURLIntoChildFrame(
+        request.resourceRequest().url(),
+        request.resourceRequest().httpReferrer(),
+        childFrame.get());
+
+    // A synchronous navigation (about:blank) would have already processed
+    // onload, so it is possible for the frame to have already been destroyed by
+    // script in the page.
+    if (!childFrame->tree()->parent())
+        return 0;
+
+    return childFrame.release();
+}
+
+void WebFrameImpl::layout()
+{
+    // layout this frame
+    FrameView* view = m_frame->view();
+    if (view)
+        view->layoutIfNeededRecursive();
+}
+
+void WebFrameImpl::paint(WebCanvas* canvas, const WebRect& rect)
+{
+    if (rect.isEmpty())
+        return;
+    IntRect dirtyRect(rect);
+#if WEBKIT_USING_CG
+    GraphicsContext gc(canvas);
+    LocalCurrentGraphicsContext localContext(&gc);
+#elif WEBKIT_USING_SKIA
+    PlatformContextSkia context(canvas);
+
+    // PlatformGraphicsContext is actually a pointer to PlatformContextSkia
+    GraphicsContext gc(reinterpret_cast<PlatformGraphicsContext*>(&context));
+#else
+    notImplemented();
+#endif
+    gc.save();
+    if (m_frame->document() && frameView()) {
+        gc.clip(dirtyRect);
+        frameView()->paint(&gc, dirtyRect);
+        m_frame->page()->inspectorController()->drawNodeHighlight(gc);
+    } else
+        gc.fillRect(dirtyRect, Color::white);
+    gc.restore();
+}
+
+void WebFrameImpl::createFrameView()
+{
+    ASSERT(m_frame); // If m_frame doesn't exist, we probably didn't init properly.
+
+    Page* page = m_frame->page();
+    ASSERT(page);
+
+    ASSERT(page->mainFrame() != 0);
+
+    bool isMainFrame = m_frame == page->mainFrame();
+    if (isMainFrame && m_frame->view())
+        m_frame->view()->setParentVisible(false);
+
+    m_frame->setView(0);
+
+    WebViewImpl* webView = viewImpl();
+
+    RefPtr<FrameView> view;
+    if (isMainFrame)
+        view = FrameView::create(m_frame, webView->size());
+    else
+        view = FrameView::create(m_frame);
+
+    m_frame->setView(view);
+
+    if (webView->isTransparent())
+        view->setTransparent(true);
+
+    // FIXME: The Mac code has a comment about this possibly being unnecessary.
+    // See installInFrame in WebCoreFrameBridge.mm
+    if (m_frame->ownerRenderer())
+        m_frame->ownerRenderer()->setWidget(view.get());
+
+    if (HTMLFrameOwnerElement* owner = m_frame->ownerElement())
+        view->setCanHaveScrollbars(owner->scrollingMode() != ScrollbarAlwaysOff);
+
+    if (isMainFrame)
+        view->setParentVisible(true);
+}
+
+WebFrameImpl* WebFrameImpl::fromFrame(Frame* frame)
+{
+    if (!frame)
+        return 0;
+
+    return static_cast<FrameLoaderClientImpl*>(frame->loader()->client())->webFrame();
+}
+
+WebViewImpl* WebFrameImpl::viewImpl() const
+{
+    if (!m_frame)
+        return 0;
+
+    return WebViewImpl::fromPage(m_frame->page());
+}
+
+WebDataSourceImpl* WebFrameImpl::dataSourceImpl() const
+{
+    return static_cast<WebDataSourceImpl*>(dataSource());
+}
+
+WebDataSourceImpl* WebFrameImpl::provisionalDataSourceImpl() const
+{
+    return static_cast<WebDataSourceImpl*>(provisionalDataSource());
+}
+
+void WebFrameImpl::setFindEndstateFocusAndSelection()
+{
+    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
+
+    if (this == mainFrameImpl->activeMatchFrame() && m_activeMatch.get()) {
+        // If the user has set the selection since the match was found, we
+        // don't focus anything.
+        VisibleSelection selection(frame()->selection()->selection());
+        if (!selection.isNone())
+            return;
+
+        // Try to find the first focusable node up the chain, which will, for
+        // example, focus links if we have found text within the link.
+        Node* node = m_activeMatch->firstNode();
+        while (node && !node->isFocusable() && node != frame()->document())
+            node = node->parent();
+
+        if (node && node != frame()->document()) {
+            // Found a focusable parent node. Set focus to it.
+            frame()->document()->setFocusedNode(node);
+        } else {
+            // Iterate over all the nodes in the range until we find a focusable node.
+            // This, for example, sets focus to the first link if you search for
+            // text and text that is within one or more links.
+            node = m_activeMatch->firstNode();
+            while (node && node != m_activeMatch->pastLastNode()) {
+                if (node->isFocusable()) {
+                    frame()->document()->setFocusedNode(node);
+                    break;
+                }
+                node = node->traverseNextNode();
+            }
+        }
+    }
+}
+
+void WebFrameImpl::didFail(const ResourceError& error, bool wasProvisional)
+{
+    if (!client())
+        return;
+    WebURLError webError = error;
+    if (wasProvisional)
+        client()->didFailProvisionalLoad(this, webError);
+    else
+        client()->didFailLoad(this, webError);
+}
+
+void WebFrameImpl::setAllowsScrolling(bool flag)
+{
+    m_frame->view()->setCanHaveScrollbars(flag);
+}
+
+void WebFrameImpl::registerPasswordListener(
+    PassRefPtr<HTMLInputElement> inputElement,
+    PasswordAutocompleteListener* listener)
+{
+    RefPtr<HTMLInputElement> element = inputElement;
+    ASSERT(m_passwordListeners.find(element) == m_passwordListeners.end());
+    m_passwordListeners.set(element, listener);
+}
+
+PasswordAutocompleteListener* WebFrameImpl::getPasswordListener(
+    HTMLInputElement* inputElement)
+{
+    return m_passwordListeners.get(RefPtr<HTMLInputElement>(inputElement));
+}
+
+// WebFrameImpl private --------------------------------------------------------
+
+void WebFrameImpl::closing()
+{
+    m_frame = 0;
+}
+
+void WebFrameImpl::invalidateArea(AreaToInvalidate area)
+{
+    ASSERT(frame() && frame()->view());
+    FrameView* view = frame()->view();
+
+    if ((area & InvalidateAll) == InvalidateAll)
+        view->invalidateRect(view->frameRect());
+    else {
+        if ((area & InvalidateContentArea) == InvalidateContentArea) {
+            IntRect contentArea(
+                view->x(), view->y(), view->visibleWidth(), view->visibleHeight());
+            view->invalidateRect(contentArea);
+        }
+
+        if ((area & InvalidateScrollbar) == InvalidateScrollbar) {
+            // Invalidate the vertical scroll bar region for the view.
+            IntRect scrollBarVert(
+                view->x() + view->visibleWidth(), view->y(),
+                ScrollbarTheme::nativeTheme()->scrollbarThickness(),
+                view->visibleHeight());
+            view->invalidateRect(scrollBarVert);
+        }
+    }
+}
+
+void WebFrameImpl::addMarker(Range* range, bool activeMatch)
+{
+    // Use a TextIterator to visit the potentially multiple nodes the range
+    // covers.
+    TextIterator markedText(range);
+    for (; !markedText.atEnd(); markedText.advance()) {
+        RefPtr<Range> textPiece = markedText.range();
+        int exception = 0;
+
+        DocumentMarker marker = {
+            DocumentMarker::TextMatch,
+            textPiece->startOffset(exception),
+            textPiece->endOffset(exception),
+            "",
+            activeMatch
+        };
+
+        if (marker.endOffset > marker.startOffset) {
+            // Find the node to add a marker to and add it.
+            Node* node = textPiece->startContainer(exception);
+            frame()->document()->addMarker(node, marker);
+
+            // Rendered rects for markers in WebKit are not populated until each time
+            // the markers are painted. However, we need it to happen sooner, because
+            // the whole purpose of tickmarks on the scrollbar is to show where
+            // matches off-screen are (that haven't been painted yet).
+            Vector<DocumentMarker> markers = frame()->document()->markersForNode(node);
+            frame()->document()->setRenderedRectForMarker(
+                textPiece->startContainer(exception),
+                markers[markers.size() - 1],
+                range->boundingBox());
+        }
+    }
+}
+
+void WebFrameImpl::setMarkerActive(Range* range, bool active)
+{
+    if (!range)
+        return;
+
+    frame()->document()->setMarkersActive(range, active);
+}
+
+int WebFrameImpl::ordinalOfFirstMatchForFrame(WebFrameImpl* frame) const
+{
+    int ordinal = 0;
+    WebFrameImpl* mainFrameImpl = viewImpl()->mainFrameImpl();
+    // Iterate from the main frame up to (but not including) |frame| and
+    // add up the number of matches found so far.
+    for (WebFrameImpl* it = mainFrameImpl;
+         it != frame;
+         it = static_cast<WebFrameImpl*>(it->traverseNext(true))) {
+        if (it->m_lastMatchCount > 0)
+            ordinal += it->m_lastMatchCount;
+    }
+    return ordinal;
+}
+
+bool WebFrameImpl::shouldScopeMatches(const String& searchText)
+{
+    // Don't scope if we can't find a frame or if the frame is not visible.
+    // The user may have closed the tab/application, so abort.
+    if (!frame() || !hasVisibleContent())
+        return false;
+
+    ASSERT(frame()->document() && frame()->view());
+
+    // If the frame completed the scoping operation and found 0 matches the last
+    // time it was searched, then we don't have to search it again if the user is
+    // just adding to the search string or sending the same search string again.
+    if (m_scopingComplete && !m_lastSearchString.isEmpty() && m_lastMatchCount == 0) {
+        // Check to see if the search string prefixes match.
+        String previousSearchPrefix =
+            searchText.substring(0, m_lastSearchString.length());
+
+        if (previousSearchPrefix == m_lastSearchString)
+            return false;  // Don't search this frame, it will be fruitless.
+    }
+
+    return true;
+}
+
+void WebFrameImpl::scopeStringMatchesSoon(int identifier, const WebString& searchText,
+                                          const WebFindOptions& options, bool reset)
+{
+    m_deferredScopingWork.append(new DeferredScopeStringMatches(
+        this, identifier, searchText, options, reset));
+}
+
+void WebFrameImpl::callScopeStringMatches(DeferredScopeStringMatches* caller,
+                                          int identifier, const WebString& searchText,
+                                          const WebFindOptions& options, bool reset)
+{
+    m_deferredScopingWork.remove(m_deferredScopingWork.find(caller));
+
+    scopeStringMatches(identifier, searchText, options, reset);
+
+    // This needs to happen last since searchText is passed by reference.
+    delete caller;
+}
+
+void WebFrameImpl::invalidateIfNecessary()
+{
+    if (m_lastMatchCount > m_nextInvalidateAfter) {
+        // FIXME: (http://b/1088165) Optimize the drawing of the tickmarks and
+        // remove this. This calculation sets a milestone for when next to
+        // invalidate the scrollbar and the content area. We do this so that we
+        // don't spend too much time drawing the scrollbar over and over again.
+        // Basically, up until the first 500 matches there is no throttle.
+        // After the first 500 matches, we set set the milestone further and
+        // further out (750, 1125, 1688, 2K, 3K).
+        static const int startSlowingDownAfter = 500;
+        static const int slowdown = 750;
+        int i = (m_lastMatchCount / startSlowingDownAfter);
+        m_nextInvalidateAfter += i * slowdown;
+
+        invalidateArea(InvalidateScrollbar);
+    }
+}
+
+void WebFrameImpl::clearPasswordListeners()
+{
+    deleteAllValues(m_passwordListeners);
+    m_passwordListeners.clear();
+}
+
+void WebFrameImpl::loadJavaScriptURL(const KURL& url)
+{
+    // This is copied from FrameLoader::executeIfJavaScriptURL.  Unfortunately,
+    // we cannot just use that method since it is private, and it also doesn't
+    // quite behave as we require it to for bookmarklets.  The key difference is
+    // that we need to suppress loading the string result from evaluating the JS
+    // URL if executing the JS URL resulted in a location change.  We also allow
+    // a JS URL to be loaded even if scripts on the page are otherwise disabled.
+
+    if (!m_frame->document() || !m_frame->page())
+        return;
+
+    String script = decodeURLEscapeSequences(url.string().substring(strlen("javascript:")));
+    ScriptValue result = m_frame->script()->executeScript(script, true);
+
+    String scriptResult;
+    if (!result.getString(scriptResult))
+        return;
+
+    SecurityOrigin* securityOrigin = m_frame->document()->securityOrigin();
+
+    if (!m_frame->redirectScheduler()->locationChangePending()) {
+        m_frame->loader()->stopAllLoaders();
+        m_frame->loader()->begin(m_frame->loader()->url(), true, securityOrigin);
+        m_frame->loader()->write(scriptResult);
+        m_frame->loader()->end();
+    }
+}
+
+} // namespace WebKit