[blink] Support (semi-)transparent background colors in WebView/Frame.

third_party/WebKit/Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 8098 matching lines @@
   EXPECT_EQ(200, layoutViewItem.logicalWidth().floor());
   EXPECT_EQ(400, layoutViewItem.logicalHeight().floor());
   EXPECT_FLOAT_EQ(0.5, webViewImpl->minimumPageScaleFactor());
   EXPECT_FLOAT_EQ(5.0, webViewImpl->maximumPageScaleFactor());
 }
 
 namespace {
 
 class TestFullscreenWebLayerTreeView : public WebLayerTreeView {
  public:
-  void setHasTransparentBackground(bool value) override {
-    hasTransparentBackground = value;
+  void setBackgroundColor(blink::WebColor color) override {
+    hasTransparentBackground = SkColorGetA(color) < SK_AlphaOPAQUE;
   }
   bool hasTransparentBackground = false;
 };
 
 class TestFullscreenWebViewClient : public FrameTestHelpers::TestWebViewClient {
  public:
   WebLayerTreeView* initializeLayerTreeView() override {
     return &testFullscreenLayerTreeView;
   }
   TestFullscreenWebLayerTreeView testFullscreenLayerTreeView;
@@ skipping 3298 matching lines @@
   EXPECT_FALSE(testSelectAll("<textarea></textarea>"));
   EXPECT_TRUE(testSelectAll("<textarea>nonempty</textarea>"));
   EXPECT_FALSE(testSelectAll("<input>"));
   EXPECT_TRUE(testSelectAll("<input value='nonempty'>"));
   // TODO(amaralp): Empty contenteditable should not have select all enabled.
   EXPECT_TRUE(testSelectAll("<div contenteditable></div>"));
   EXPECT_TRUE(testSelectAll("<div contenteditable>nonempty</div>"));
 }
 
 }  // namespace blink