Re-enable IOSurface Canvas2D.

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.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 288 matching lines @@
 
     restoreFramebufferBindings();
     m_contentsChanged = false;
 
     m_context->produceTextureDirectCHROMIUM(frontColorBufferMailbox->textureInfo.textureId, frontColorBufferMailbox->textureInfo.parameters.target, frontColorBufferMailbox->mailbox.name);
     const WGC3Duint64 fenceSync = m_context->insertFenceSyncCHROMIUM();
     m_context->flush();
     frontColorBufferMailbox->mailbox.validSyncToken = m_context->genSyncTokenCHROMIUM(fenceSync, frontColorBufferMailbox->mailbox.syncToken);
     frontColorBufferMailbox->mailbox.allowOverlay = frontColorBufferMailbox->textureInfo.imageId != 0;
     frontColorBufferMailbox->mailbox.textureTarget = frontColorBufferMailbox->textureInfo.parameters.target;
+    frontColorBufferMailbox->mailbox.textureSize = WebSize(m_size.width(), m_size.height());
     setBufferClearNeeded(true);
 
     // set m_parentDrawingBuffer to make sure 'this' stays alive as long as it has live mailboxes
     ASSERT(!frontColorBufferMailbox->m_parentDrawingBuffer);
     frontColorBufferMailbox->m_parentDrawingBuffer = this;
     *outMailbox = frontColorBufferMailbox->mailbox;
     m_frontColorBuffer = { frontColorBufferMailbox->textureInfo, frontColorBufferMailbox->mailbox };
     return true;
 }
 
@@ skipping 711 matching lines @@
 
     if (m_antiAliasingMode == MSAAImplicitResolve)
         m_context->framebufferTexture2DMultisampleEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target, m_colorBuffer.textureId, 0, m_sampleCount);
     else
         m_context->framebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target, m_colorBuffer.textureId, 0);
 
     m_context->bindTexture(GL_TEXTURE_2D, m_texture2DBinding);
 }
 
 } // namespace blink