WebGL GL_RGB emulation to support IOSurfaces on Mac.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
index a477c75a46dc1cb42f20534e4f2fbb786f326b60..c964acccf7979068a07e47ef14716604c0eb2f22 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
@@ -753,7 +753,8 @@ protected:
 
     // Errors raised by synthesizeGLError() while the context is lost.
     Vector<GLenum> m_lostContextErrors;
-    // Other errors raised by synthesizeGLError().
+    // Other errors raised by synthesizeGLError(), or errors transfered from the
+    // service side's error queue.
     Vector<GLenum> m_syntheticErrors;
 
     bool m_isWebGL2FormatsTypesAdded;
@@ -795,6 +796,10 @@ protected:
     // Helper to restore state that clearing the framebuffer may destroy.
     void restoreStateAfterClear();
 
+    // Moves all errors from the service side's error queue into this class's
+    // internal queue |m_syntheticErrors|.
+    void moveGLErrorsToInternalQueue();
+
     // Convert texture internal format.
     GLenum convertTexInternalFormat(GLenum internalformat, GLenum type);