Implement ScrollView::inWindow by plumbing through RenderWidget::is_hidden to improve performance when a tab is in the background.

BUG=2525

Review URL: http://codereview.chromium.org/6503

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@3147 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 18 insertions, 0 deletions

diff --git a/webkit/glue/webview_impl.cc b/webkit/glue/webview_impl.cc
index 85ef80d..ca86104 100644
--- a/webkit/glue/webview_impl.cc
+++ b/webkit/glue/webview_impl.cc
@@ -1469,6 +1469,13 @@ size_t WebViewImpl::getActiveTickmarkIndex(WebCore::Frame* frame) {
   return webframe_impl->active_tickmark_index();
 }
 
+bool WebViewImpl::isHidden() {
+  if (!delegate_)
+    return true;
+
+  return delegate_->IsHidden();
+}
+
 //-----------------------------------------------------------------------------
 // WebCore::BackForwardListClient
 
diff --git a/webkit/glue/webview_impl.h b/webkit/glue/webview_impl.h
index 1fb2ebb..ebe9e14 100644
--- a/webkit/glue/webview_impl.h
+++ b/webkit/glue/webview_impl.h
@@ -203,6 +203,7 @@ class WebViewImpl : public WebView,
   virtual const WTF::Vector<RefPtr<WebCore::Range> >* getTickmarks(
       WebCore::Frame* frame);
   virtual size_t getActiveTickmarkIndex(WebCore::Frame* frame);
+  virtual bool isHidden();
 
   // WebCore::BackForwardListClient
   virtual void didAddHistoryItem(WebCore::HistoryItem* item);
diff --git a/webkit/glue/webwidget_delegate.h b/webkit/glue/webwidget_delegate.h
index faf4d0a..45d0dcc 100644
--- a/webkit/glue/webwidget_delegate.h
+++ b/webkit/glue/webwidget_delegate.h
@@ -79,6 +79,9 @@ class WebWidgetDelegate {
   virtual void AddRef() = 0;
   virtual void Release() = 0;
 
+  // Returns true if the widget is in a background tab.
+  virtual bool IsHidden() = 0;
+
   WebWidgetDelegate() { }
   virtual ~WebWidgetDelegate() { }
 
diff --git a/webkit/glue/webwidget_impl.cc b/webkit/glue/webwidget_impl.cc
index 36952e0..eb7870a 100644
--- a/webkit/glue/webwidget_impl.cc
+++ b/webkit/glue/webwidget_impl.cc
@@ -252,3 +252,9 @@ void WebWidgetImpl::setFocus() {
   delegate_->Focus(this);
 }
 
+bool WebWidgetImpl::isHidden() {
+  if (!delegate_)
+    return true;
+
+  return delegate_->IsHidden();
+}
diff --git a/webkit/glue/webwidget_impl.h b/webkit/glue/webwidget_impl.h
index 5c706a7..ddb4fde 100644
--- a/webkit/glue/webwidget_impl.h
+++ b/webkit/glue/webwidget_impl.h
@@ -85,6 +85,7 @@ class WebWidgetImpl : public WebWidget, public WebCore::WidgetClientWin {
   virtual const WTF::Vector<RefPtr<WebCore::Range> >* getTickmarks(
       WebCore::Frame* frame);
   virtual size_t getActiveTickmarkIndex(WebCore::Frame* frame);
+  virtual bool isHidden();
 
   WebWidgetDelegate* delegate_;
   gfx::Size size_;