[Android WebView] Implement the capture picture API.

android_webview/renderer/aw_render_view_ext.cc

Index: android_webview/renderer/aw_render_view_ext.cc
diff --git a/android_webview/renderer/aw_render_view_ext.cc b/android_webview/renderer/aw_render_view_ext.cc
index 08475a8274ab1ac27fe828a44beeddeb82c965e2..4c08762db3be940db8408c5bc289c592ec656703 100644
--- a/android_webview/renderer/aw_render_view_ext.cc
+++ b/android_webview/renderer/aw_render_view_ext.cc
@@ -49,6 +49,8 @@ AwRenderViewExt::AwRenderViewExt(content::RenderView* render_view)
     : content::RenderViewObserver(render_view) {
   render_view->GetWebView()->setPermissionClient(this);
   // TODO(leandrogracia): enable once the feature is available in RenderView.
+  // TODO(leandrogracia): remove when SW rendering uses Ubercompositor.
+  // Until then we need the callback enabled for SW mode invalidation.
   //render_view->SetCapturePictureCallback(
   //    base::Bind(&AwRenderViewExt::OnPictureUpdate, AsWeakPtr()));
 }
@@ -72,6 +74,8 @@ bool AwRenderViewExt::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(AwViewMsg_DoHitTest, OnDoHitTest)
     IPC_MESSAGE_HANDLER(AwViewMsg_EnableCapturePictureCallback,
                         OnEnableCapturePictureCallback)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(AwViewMsg_CapturePictureSync,
+                        OnCapturePictureSync)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -205,4 +209,11 @@ void AwRenderViewExt::OnPictureUpdate(skia::RefPtr<SkPicture> picture) {
   Send(new AwViewHostMsg_PictureUpdated(routing_id()));
 }
 
+void AwRenderViewExt::OnCapturePictureSync(IPC::Message* reply_msg) {
+  // TODO(leandrogracia): enable once the feature is available in RenderView.
+  //RendererPictureMap::GetInstance()->SetRendererPicture(
+  //    routing_id(), render_view()->CapturePicture());
+  Send(reply_msg);
+}
+
 }  // namespace android_webview