Fix non-anti-aliased frame update.

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h

 /*
  * 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 150 matching lines @@
   // GL_DRAW_FRAMEBUFFER.
   void resolveAndBindForReadAndDraw();
 
   bool multisample() const;
 
   bool discardFramebufferSupported() const {
     return m_discardFramebufferSupported;
   }
 
   // Returns false if the contents had previously been marked as changed and
-  // have not yet been committed.
+  // have not yet been resolved.
   bool markContentsChanged();
   void setBufferClearNeeded(bool);
   bool bufferClearNeeded() const;
   void setIsHidden(bool);
   void setFilterQuality(SkFilterQuality);
 
   // Whether the target for draw operations has format GL_RGBA, but is
   // emulating format GL_RGB. When the target's storage is first
   // allocated, its alpha channel must be cleared to 1. All future drawing
   // operations must use a color mask with alpha=GL_FALSE.
@@ skipping 153 matching lines @@
    private:
     WTF_MAKE_NONCOPYABLE(ColorBuffer);
   };
 
   // The same as clearFramebuffers(), but leaves GL state dirty.
   void clearFramebuffersInternal(GLbitfield clearMask);
 
   // The same as reset(), but leaves GL state dirty.
   bool resizeFramebufferInternal(const IntSize&);
 
-  // The same as commit(), but leaves GL state dirty.
+  // The same as resolveAndBindForReadAndDraw(), but leaves GL state dirty.
   void resolveMultisampleFramebufferInternal();
 
+  // Resolves m_multisampleFBO into m_fbo, if multisampling.
+  void resolveIfNeeded();
+
   bool prepareTextureMailboxInternal(
       cc::TextureMailbox* outMailbox,
       std::unique_ptr<cc::SingleReleaseCallback>* outReleaseCallback,
       bool forceGpuResult);
 
   // Helper functions to be called only by prepareTextureMailboxInternal.
   bool finishPrepareTextureMailboxGpu(
       cc::TextureMailbox* outMailbox,
       std::unique_ptr<cc::SingleReleaseCallback>* outReleaseCallback);
   bool finishPrepareTextureMailboxSoftware(
@@ skipping 116 matching lines @@
   RefPtr<ColorBuffer> m_backColorBuffer;
 
   // The ColorBuffer that was most recently presented to the compositor by
   // prepareTextureMailboxInternal.
   RefPtr<ColorBuffer> m_frontColorBuffer;
 
   // True if our contents have been modified since the last presentation of this
   // buffer.
   bool m_contentsChanged = true;
 
-  // True if commit() has been called since the last time markContentsChanged()
-  // had been called.
-  bool m_contentsChangeCommitted = false;
+  // True if resolveIfNeeded() has been called since the last time
+  // markContentsChanged() had been called.
+  bool m_contentsChangeResolved = false;
   bool m_bufferClearNeeded = false;
 
   // Whether the client wants a depth or stencil buffer.
   const bool m_wantDepth;
   const bool m_wantStencil;
 
   // The color space of this buffer. All buffers are assumed to be sRGB until
   // a mechanism for creating otherwise is exposed to the web.
   const gfx::ColorSpace m_colorSpace;
 
@@ skipping 30 matching lines @@
   // RuntimeEnabledFeatures::webGLImageChromiumEnabled() call with
   // shouldUseChromiumImage() calls, and set m_chromiumImageUsage to
   // DisallowChromiumImage in the case of OffscreenCanvas.
   ChromiumImageUsage m_chromiumImageUsage;
   bool shouldUseChromiumImage();
 };
 
 }  // namespace blink
 
 #endif  // DrawingBuffer_h