Implemented GetWindowSnapshot on RenderViewImpl

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index a3c5cf06cdfb593c863ad1e65c982822e8a2a58d..bdba3f511d723d1fb402d6a9b971bb9872daa60f 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -593,6 +593,7 @@ RenderViewImpl::RenderViewImpl(
 #endif
       session_storage_namespace_id_(session_storage_namespace_id),
       handling_select_range_(false),
+      next_snapshot_id_(0),
 #if defined(OS_WIN)
       focused_plugin_id_(-1),
 #endif
@@ -1002,6 +1003,8 @@ bool RenderViewImpl::OnMessageReceived(const IPC::Message& message) {
 #endif
     IPC_MESSAGE_HANDLER(ViewMsg_ReleaseDisambiguationPopupDIB,
                         OnReleaseDisambiguationPopupDIB)
+    IPC_MESSAGE_HANDLER(ViewMsg_WindowSnapshotCompleted,
+                        OnWindowSnapshotCompleted)
 
     // Have the super handle all other messages.
     IPC_MESSAGE_UNHANDLED(handled = RenderWidget::OnMessageReceived(message))
@@ -1708,6 +1711,20 @@ bool RenderViewImpl::SendAndRunNestedMessageLoop(IPC::SyncMessage* message) {
   return Send(message);
 }
 
+void RenderViewImpl::GetWindowSnapshot(const WindowSnapshotCallback& callback) {
+  int id = next_snapshot_id_++;
+  pending_snapshots_.insert(std::make_pair(id, callback));
+  Send(new ViewHostMsg_GetWindowSnapshot(routing_id_, id));
+}
+
+void RenderViewImpl::OnWindowSnapshotCompleted(const int snapshot_id,

[jamesr, 2012/11/12 18:41:19]

we don't typically use const for primitive parameters - it doesn't mean much
since the function gets a copy of the value anyway

+    const gfx::Size& size, const std::vector<unsigned char>& png) {
+  PendingSnapshotMap::iterator it = pending_snapshots_.find(snapshot_id);
+  DCHECK(it != pending_snapshots_.end());
+  it->second.Run(size, png);
+  pending_snapshots_.erase(it);
+}
+
 // WebKit::WebViewClient ------------------------------------------------------
 
 WebView* RenderViewImpl::createView(