WebGL: Three small fixes to Image CHROMIUM logic.

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 170 matching lines @@
     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.
     bool requiresAlphaChannelToBePreserved();
 
+    // Similar to requiresAlphaChannelToBePreserved(), but always targets the
+    // default framebuffer.
+    bool defaultBufferRequiresAlphaChannelToBePreserved();
+
     WebLayer* platformLayer();
 
     gpu::gles2::GLES2Interface* contextGL();
     WebGraphicsContext3DProvider* contextProvider();
 
     // WebExternalTextureLayerClient implementation.
     bool prepareMailbox(WebExternalTextureMailbox*, WebExternalBitmap*) override;
     void mailboxReleased(const WebExternalTextureMailbox&, bool lostResource = false) override;
 
     // Destroys the TEXTURE_2D binding for the owned context
@@ skipping 146 matching lines @@
     // implemented by forwarding all draw operations to a multisample
     // renderbuffer, which is resolved before any read operations or swaps.
     bool wantExplicitResolve();
 
     // Whether the WebGL client wants a depth or stencil buffer.
     bool wantDepthOrStencil();
 
     // The format to use when creating a multisampled renderbuffer.
     GLenum getMultisampledRenderbufferFormat();
 
-    // Similar to requiresAlphaChannelToBePreserved(), but always targets the
-    // default framebuffer.
-    bool defaultBufferRequiresAlphaChannelToBePreserved();
-
     const PreserveDrawingBuffer m_preserveDrawingBuffer;
     bool m_scissorEnabled = false;
     GLuint m_texture2DBinding = 0;
     GLuint m_drawFramebufferBinding = 0;
     GLuint m_readFramebufferBinding = 0;
     GLuint m_renderbufferBinding = 0;
     GLenum m_activeTextureUnit = GL_TEXTURE0;
     GLfloat m_clearColor[4];
     GLboolean m_colorMask[4];
 
@@ skipping 74 matching lines @@
     // used to resize the Canvas.
     SkBitmap m_resizingBitmap;
 
     // Used to flip a bitmap vertically.
     Vector<uint8_t> m_scanline;
 };
 
 } // namespace blink
 
 #endif // DrawingBuffer_h