Enable slimming paint by default (for trybots only)

Source/web/tests/WebViewTest.cpp

 /*
  * Copyright (C) 2011, 2012 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:
  *
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@@ skipping 488 matching lines @@
     EXPECT_NE(kBlue, webView->backgroundColor());
     // webView does not have a frame yet, but we should still be able to set the background color.
     webView->setBaseBackgroundColor(kBlue);
     EXPECT_EQ(kBlue, webView->backgroundColor());
     WebLocalFrameImpl* frame = WebLocalFrameImpl::create(WebTreeScopeType::Document, nullptr);
     webView->setMainFrame(frame);
     webView->close();
     frame->close();
 }
 
-TEST_F(WebViewTest, SetBaseBackgroundColorAndBlendWithExistingContent)
+TEST_F(WebViewTest, DISABLED_SetBaseBackgroundColorAndBlendWithExistingContent)

[wkorman, 2015/06/09 23:31:06]

Do you remember what prompted need to disable this? It hasn't come up yet in
failures. Maybe the underlying issue has since been resolved?

[Xianzhu, 2015/06/09 23:52:19]

Perhaps because of incompatible painting method at that time. We are using
SkPictureRecorder now so the incompatibility should be gone.

Just remembered that I disabled the tests because at that time I modified
RuntimeEnabledFeatures.in to enable slimming paint but later found it didn't
work (because the flag is overridden by chrome). I should remove all the
DISABLED_ prefixes.

 {
     const WebColor kAlphaRed = 0x80FF0000;
     const WebColor kAlphaGreen = 0x8000FF00;
     const int kWidth = 100;
     const int kHeight = 100;
 
     WebView* webView = m_webViewHelper.initialize();
 
     // Set WebView background to green with alpha.
     webView->setBaseBackgroundColor(kAlphaGreen);
@@ skipping 2524 matching lines @@
     for (size_t i = 0; i < renders.size(); ++i) {
         double docStartTime = frame->domWindow()->document()->loader()->timing().monotonicTimeToZeroBasedDocumentTime(renderPairs[i].startTime) * 1000.0;
         ASSERT_DOUBLE_EQ(docStartTime, renders[i]->startTime());
         double docFinishTime = frame->domWindow()->document()->loader()->timing().monotonicTimeToZeroBasedDocumentTime(renderPairs[i].finishTime) * 1000.0;
         double docDuration = docFinishTime - docStartTime;
         ASSERT_DOUBLE_EQ(docDuration, renders[i]->duration());
     }
 }
 
 } // namespace