[content] Fix background color update handling in RWHVAura.

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 38 matching lines @@
 
 RenderWidgetHostViewChildFrame::RenderWidgetHostViewChildFrame(
     RenderWidgetHost* widget_host)
     : host_(RenderWidgetHostImpl::From(widget_host)),
       frame_sink_id_(
           base::checked_cast<uint32_t>(widget_host->GetProcess()->GetID()),
           base::checked_cast<uint32_t>(widget_host->GetRoutingID())),
       next_surface_sequence_(1u),
       current_surface_scale_factor_(1.f),
       frame_connector_(nullptr),
+      background_color_(SK_ColorWHITE),
       weak_factory_(this) {
   GetSurfaceManager()->RegisterFrameSinkId(frame_sink_id_);
   CreateCompositorFrameSinkSupport();
 }
 
 RenderWidgetHostViewChildFrame::~RenderWidgetHostViewChildFrame() {
   ResetCompositorFrameSinkSupport();
   if (GetSurfaceManager())
     GetSurfaceManager()->InvalidateFrameSinkId(frame_sink_id_);
 }
@@ skipping 135 matching lines @@
   return nullptr;
 }
 
 gfx::NativeViewAccessible
 RenderWidgetHostViewChildFrame::GetNativeViewAccessible() {
   NOTREACHED();
   return nullptr;
 }
 
 void RenderWidgetHostViewChildFrame::SetBackgroundColor(SkColor color) {
-  RenderWidgetHostViewBase::SetBackgroundColor(color);
-  bool opaque = GetBackgroundOpaque();
-  host_->SetBackgroundOpaque(opaque);
+  background_color_ = color;
+
+  DCHECK(SkColorGetA(color) == SK_AlphaOPAQUE ||
+         SkColorGetA(color) == SK_AlphaTRANSPARENT);
+  host_->SetBackgroundOpaque(SkColorGetA(color) == SK_AlphaOPAQUE);
+}
+
+SkColor RenderWidgetHostViewChildFrame::background_color() const {
+  return background_color_;
 }
 
 gfx::Size RenderWidgetHostViewChildFrame::GetPhysicalBackingSize() const {
   gfx::Size size;
   if (frame_connector_) {
     content::ScreenInfo screen_info;
     host_->GetScreenInfo(&screen_info);
     size = gfx::ScaleToCeiledSize(frame_connector_->ChildFrameRect().size(),
                                   screen_info.device_scale_factor);
   }
@@ skipping 468 matching lines @@
                                                       frame_sink_id_);
   }
   support_.reset();
 }
 
 bool RenderWidgetHostViewChildFrame::HasEmbedderChanged() {
   return false;
 }
 
 }  // namespace content