[content] Fix background color update handling in RWHVAura.

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include <utility>
 
@@ skipping 434 matching lines @@
       latest_confirmed_begin_frame_source_id_(0),
       latest_confirmed_begin_frame_sequence_number_(
           cc::BeginFrameArgs::kInvalidFrameNumber),
       outstanding_begin_frame_requests_(0),
       is_showing_(!widget_host->is_hidden()),
       is_window_visible_(true),
       is_window_activity_started_(true),
       is_in_vr_(false),
       content_view_core_(nullptr),
       ime_adapter_android_(nullptr),
+      background_color_(SK_ColorWHITE),
       cached_background_color_(SK_ColorWHITE),
       view_(this),
       gesture_provider_(ui::GetGestureProviderConfig(
                             ui::GestureProviderConfigType::CURRENT_PLATFORM),
                         this),
       stylus_text_selector_(this),
       using_browser_compositor_(CompositorImpl::IsInitialized()),
       synchronous_compositor_client_(nullptr),
       frame_evictor_(new DelegatedFrameEvictor(this)),
       observing_root_window_(false),
@@ skipping 566 matching lines @@
 
   delete this;
 }
 
 void RenderWidgetHostViewAndroid::SetTooltipText(
     const base::string16& tooltip_text) {
   // Tooltips don't makes sense on Android.
 }
 
 void RenderWidgetHostViewAndroid::SetBackgroundColor(SkColor color) {
-  RenderWidgetHostViewBase::SetBackgroundColor(color);
-  host_->SetBackgroundOpaque(GetBackgroundOpaque());
+  background_color_ = color;
+
+  DCHECK(SkColorGetA(color) == SK_AlphaOPAQUE ||
+         SkColorGetA(color) == SK_AlphaTRANSPARENT);
+  host_->SetBackgroundOpaque(SkColorGetA(color) == SK_AlphaOPAQUE);
   UpdateBackgroundColor(color);
 }
 
+SkColor RenderWidgetHostViewAndroid::background_color() const {
+  return background_color_;
+}
+
 void RenderWidgetHostViewAndroid::CopyFromSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     const ReadbackRequestCallback& callback,
     const SkColorType preferred_color_type) {
   TRACE_EVENT0("cc", "RenderWidgetHostViewAndroid::CopyFromSurface");
   if (!host_ || !IsSurfaceAvailableForCopy()) {
     callback.Run(SkBitmap(), READBACK_SURFACE_UNAVAILABLE);
     return;
   }
@@ skipping 1119 matching lines @@
 
   ui::WindowAndroidCompositor* compositor = window_android->GetCompositor();
   if (!compositor)
     return;
 
   overscroll_controller_ = base::MakeUnique<OverscrollControllerAndroid>(
       overscroll_refresh_handler, compositor, view_.GetDipScale());
 }
 
 }  // namespace content