WebGL: Three small fixes to Image CHROMIUM logic.

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

Index: third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
index ea1dd22557cccc43e0d41d9515b49f13407c39df..b0a31dfd4fac4507089b22facb285866e845287b 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
+++ b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
@@ -188,6 +188,10 @@ public:
     // 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();
@@ -354,10 +358,6 @@ private:
     // 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;