OnDrawHardware() implementation with async messages

android_webview/browser/browser_view_renderer.cc

Index: android_webview/browser/browser_view_renderer.cc
diff --git a/android_webview/browser/browser_view_renderer.cc b/android_webview/browser/browser_view_renderer.cc
index e091edc93f872a6291b6314d0e4a87b566292c7a..15d9a49850a6481de989adb5528d631dd87a8365 100644
--- a/android_webview/browser/browser_view_renderer.cc
+++ b/android_webview/browser/browser_view_renderer.cc
@@ -239,6 +239,7 @@ bool BrowserViewRenderer::OnDrawHardware() {
     viewport_rect_for_tile_priority = last_on_draw_global_visible_rect_;
   }
 
+  /* Nullptr will be received as this is now async */
   content::SynchronousCompositor::Frame frame =
       compositor_->DemandDrawHw(surface_size,
                                 gfx::Transform(),
@@ -263,6 +264,19 @@ bool BrowserViewRenderer::OnDrawHardware() {
   return true;
 }
 
+void BrowserViewRenderer::OnDrawHardwareProcessFrame(

[boliu, 2016/07/24 17:33:54]

You want to add this method to SynchronousCompositorClient

[ojars, 2016/07/28 22:53:55]

Done.

+    content::SynchronousCompositor::Frame frame) {
+  std::unique_ptr<ChildFrame> child_frame = base::WrapUnique(new ChildFrame(
+      frame.output_surface_id, std::move(frame.frame), compositor_id_,
+      viewport_rect_for_tile_priority.IsEmpty(), transform_for_tile_priority,
+      offscreen_pre_raster_, external_draw_constraints_.is_layer));
+
+  ReturnUnusedResource(
+      current_compositor_frame_consumer_->PassUncommittedFrameOnUI());
+  current_compositor_frame_consumer_->SetFrameOnUI(std::move(child_frame));
+  return true;
+}
+
 void BrowserViewRenderer::OnParentDrawConstraintsUpdated(
     CompositorFrameConsumer* compositor_frame_consumer) {
   DCHECK(compositor_frame_consumer);