OOP PDF: Override printing for MimeHandlerViewContainers.

Previously, calling print() on the window object for a plugin document
resulted in printing a blank page. This adds an OverridePrint method to
PrintWebViewHelper::Delegate so MimeHandlerViewContainers can replace
the default print behavior with posting a print message to the mime
handler.

BUG=448720

Review URL: https://codereview.chromium.org/858363002

Cr-Commit-Position: refs/heads/master@{#313011}

2 files changed, 50 insertions, 0 deletions

diff --git a/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.cc b/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.cc
index 59f3e29..9c50256 100644
--- a/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.cc
+++ b/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.cc
@@ -4,8 +4,12 @@
 
 #include "extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h"
 
+#include <map>
+#include <set>
+
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
+#include "content/public/renderer/v8_value_converter.h"
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_constants.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/guest_view/guest_view_constants.h"
@@ -71,6 +75,12 @@ class ScriptableObject : public gin::Wrappable<ScriptableObject>,
 // static
 gin::WrapperInfo ScriptableObject::kWrapperInfo = { gin::kEmbedderNativeGin };
 
+// Maps from content::RenderFrame to the set of MimeHandlerViewContainers within
+// it.
+base::LazyInstance<
+    std::map<content::RenderFrame*, std::set<MimeHandlerViewContainer*>>>
+    g_mime_handler_view_container_map = LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
 MimeHandlerViewContainer::MimeHandlerViewContainer(
@@ -85,11 +95,27 @@ MimeHandlerViewContainer::MimeHandlerViewContainer(
       weak_factory_(this) {
   DCHECK(!mime_type_.empty());
   is_embedded_ = !render_frame->GetWebFrame()->document().isPluginDocument();
+  g_mime_handler_view_container_map.Get()[render_frame].insert(this);
 }
 
 MimeHandlerViewContainer::~MimeHandlerViewContainer() {
   if (loader_)
     loader_->cancel();
+
+  g_mime_handler_view_container_map.Get()[render_frame()].erase(this);
+  if (g_mime_handler_view_container_map.Get()[render_frame()].empty())
+    g_mime_handler_view_container_map.Get().erase(render_frame());
+}
+
+// static
+std::vector<MimeHandlerViewContainer*>
+MimeHandlerViewContainer::FromRenderFrame(content::RenderFrame* render_frame) {
+  auto it = g_mime_handler_view_container_map.Get().find(render_frame);
+  if (it == g_mime_handler_view_container_map.Get().end())
+    return std::vector<MimeHandlerViewContainer*>();
+
+  return std::vector<MimeHandlerViewContainer*>(it->second.begin(),
+                                                it->second.end());
 }
 
 void MimeHandlerViewContainer::Ready() {
@@ -197,6 +223,21 @@ void MimeHandlerViewContainer::PostMessage(v8::Isolate* isolate,
       args);
 }
 
+void MimeHandlerViewContainer::PostMessageFromValue(
+    const base::Value& message) {
+  blink::WebFrame* frame = render_frame()->GetWebFrame();
+  if (!frame)
+    return;
+
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  v8::HandleScope handle_scope(isolate);
+  v8::Context::Scope context_scope(frame->mainWorldScriptContext());
+  scoped_ptr<content::V8ValueConverter> converter(
+      content::V8ValueConverter::create());
+  PostMessage(isolate,
+              converter->ToV8Value(&message, frame->mainWorldScriptContext()));
+}
+
 void MimeHandlerViewContainer::OnCreateMimeHandlerViewGuestACK(
     int element_instance_id) {
   DCHECK_NE(this->element_instance_id(), guestview::kInstanceIDNone);
diff --git a/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h b/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
index 105323d..86183f1 100644
--- a/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
+++ b/extensions/renderer/guest_view/mime_handler_view/mime_handler_view_container.h
@@ -5,6 +5,9 @@
 #ifndef EXTENSIONS_RENDERER_GUEST_VIEW_MIME_HANDLER_VIEW_MIME_HANDLER_VIEW_CONTAINER_H_
 #define EXTENSIONS_RENDERER_GUEST_VIEW_MIME_HANDLER_VIEW_MIME_HANDLER_VIEW_CONTAINER_H_
 
+#include <string>
+#include <vector>
+
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "extensions/renderer/guest_view/guest_view_container.h"
@@ -41,6 +44,9 @@ class MimeHandlerViewContainer : public GuestViewContainer,
                            const GURL& original_url);
   ~MimeHandlerViewContainer() override;
 
+  static std::vector<MimeHandlerViewContainer*> FromRenderFrame(
+      content::RenderFrame* render_frame);
+
   // BrowserPluginDelegate implementation.
   void Ready() override;
   void DidFinishLoading() override;
@@ -63,6 +69,9 @@ class MimeHandlerViewContainer : public GuestViewContainer,
   void PostMessage(v8::Isolate* isolate,
                    v8::Handle<v8::Value> message);
 
+  // Post |message| to the guest.
+  void PostMessageFromValue(const base::Value& message);
+
  private:
   // Message handlers.
   void OnCreateMimeHandlerViewGuestACK(int element_instance_id);