Changed Blimp client to start with white screen before drawing contents

blimp/client/feature/compositor/blimp_compositor_manager.cc

Index: blimp/client/feature/compositor/blimp_compositor_manager.cc
diff --git a/blimp/client/feature/compositor/blimp_compositor_manager.cc b/blimp/client/feature/compositor/blimp_compositor_manager.cc
index b44a199908c7c4f9dfc4e7d746ee781affadd4db..58f68890ce26e6ede5c21dbc6a73506e99547244 100644
--- a/blimp/client/feature/compositor/blimp_compositor_manager.cc
+++ b/blimp/client/feature/compositor/blimp_compositor_manager.cc
@@ -22,15 +22,16 @@ const int kDummyTabId = 0;
 }  // namespace
 
 BlimpCompositorManager::BlimpCompositorManager(
-    RenderWidgetFeature* render_widget_feature)
+    RenderWidgetFeature* render_widget_feature,
+    BlimpCompositorManagerClient* client)
     : visible_(false),
       window_(gfx::kNullAcceleratedWidget),
       gpu_memory_buffer_manager_(new BlimpGpuMemoryBufferManager),
-      image_serialization_processor_(
-          new BlimpImageSerializationProcessor(
-              BlimpImageSerializationProcessor::Mode::DESERIALIZATION)),
+      image_serialization_processor_(new BlimpImageSerializationProcessor(
+          BlimpImageSerializationProcessor::Mode::DESERIALIZATION)),
       active_compositor_(nullptr),
-      render_widget_feature_(render_widget_feature) {
+      render_widget_feature_(render_widget_feature),
+      client_(client) {
   DCHECK(render_widget_feature_);
   render_widget_feature_->SetDelegate(kDummyTabId, this);
 }
@@ -139,6 +140,11 @@ cc::LayerTreeSettings* BlimpCompositorManager::GetLayerTreeSettings() {
   return settings_.get();
 }
 
+void BlimpCompositorManager::DidCompleteSwapBuffers() {
+  DCHECK(client_);
+  client_->OnSwapBuffersCompleted();
+}
+
 scoped_refptr<base::SingleThreadTaskRunner>
 BlimpCompositorManager::GetCompositorTaskRunner() {
   if (compositor_thread_)