Re-land "WebGL: Transfer ownership of WebGraphicsContext3D to DrawingBuffer"

Source/platform/graphics/gpu/DrawingBufferTest.cpp

 /*
  * Copyright (C) 2013 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 92 matching lines @@
 
 static const int initialWidth = 100;
 static const int initialHeight = 100;
 static const int alternateHeight = 50;
 
 class DrawingBufferTest : public Test {
 protected:
     virtual void SetUp()
     {
         RefPtr<FakeContextEvictionManager> contextEvictionManager = adoptRef(new FakeContextEvictionManager());
-        m_context = adoptPtr(new WebGraphicsContext3DForTests);
-        m_drawingBuffer = DrawingBuffer::create(m_context.get(), IntSize(initialWidth, initialHeight), DrawingBuffer::Preserve, contextEvictionManager.release());
+        OwnPtr<WebGraphicsContext3DForTests> context = adoptPtr(new WebGraphicsContext3DForTests);
+        m_context = context.get();
+        m_drawingBuffer = DrawingBuffer::create(context.release(), IntSize(initialWidth, initialHeight), DrawingBuffer::Preserve, contextEvictionManager.release());
     }
 
     WebGraphicsContext3DForTests* webContext()
     {
-        return m_context.get();
+        return m_context;
     }
 
-    OwnPtr<WebGraphicsContext3DForTests> m_context;
+    WebGraphicsContext3DForTests* m_context;
     RefPtr<DrawingBuffer> m_drawingBuffer;
 };
 
 TEST_F(DrawingBufferTest, testPaintRenderingResultsToCanvas)
 {
     OwnPtr<ImageBufferSurface> imageBufferSurface = adoptPtr(new UnacceleratedImageBufferSurface(IntSize(initialWidth, initialHeight)));
     EXPECT_FALSE(!imageBufferSurface);
     EXPECT_TRUE(imageBufferSurface->isValid());
     OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(imageBufferSurface.release());
     EXPECT_FALSE(!imageBuffer);
     EXPECT_FALSE(imageBuffer->isAccelerated());
     EXPECT_FALSE(imageBuffer->bitmap().isNull());
     m_drawingBuffer->paintRenderingResultsToCanvas(imageBuffer.get());
     EXPECT_FALSE(imageBuffer->isAccelerated());
     EXPECT_FALSE(imageBuffer->bitmap().isNull());
 }
 
-TEST_F(DrawingBufferTest, verifyNoNewBuffersAfterContextLostWithMailboxes)
-{
-    // Tell the buffer its contents changed and context was lost.
-    m_drawingBuffer->markContentsChanged();
-    m_drawingBuffer->releaseResources();
-
-    blink::WebExternalTextureMailbox mailbox;
-    EXPECT_FALSE(m_drawingBuffer->prepareMailbox(&mailbox, 0));
-}
-
 TEST_F(DrawingBufferTest, verifyResizingProperlyAffectsMailboxes)
 {
     blink::WebExternalTextureMailbox mailbox;
 
     IntSize initialSize(initialWidth, initialHeight);
     IntSize alternateSize(initialWidth, alternateHeight);
 
     // Produce one mailbox at size 100x100.
     m_drawingBuffer->markContentsChanged();
     EXPECT_TRUE(m_drawingBuffer->prepareMailbox(&mailbox, 0));
@@ skipping 74 matching lines @@
     EXPECT_TRUE(m_drawingBuffer->prepareMailbox(&recycledMailbox, 0));
     EXPECT_EQ(TextureMailboxWrapper(mailbox3), TextureMailboxWrapper(recycledMailbox));
 
     // The third recycled mailbox must be 1.
     m_drawingBuffer->markContentsChanged();
     EXPECT_TRUE(m_drawingBuffer->prepareMailbox(&recycledMailbox, 0));
     EXPECT_EQ(TextureMailboxWrapper(mailbox1), TextureMailboxWrapper(recycledMailbox));
 }
 
 } // namespace