Add GL_CHROMIUM_framebuffer_multisample support to Chromium's...

chrome/renderer/webgraphicscontext3d_command_buffer_impl.h

Index: chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
===================================================================
--- chrome/renderer/webgraphicscontext3d_command_buffer_impl.h	(revision 72421)
+++ chrome/renderer/webgraphicscontext3d_command_buffer_impl.h	(working copy)
@@ -364,6 +364,14 @@
   virtual WebKit::WebString getRequestableExtensionsCHROMIUM();
   virtual void requestExtensionCHROMIUM(const char*);
 
+  virtual void blitFramebufferCHROMIUM(
+      int srcX0, int srcY0, int srcX1, int srcY1,
+      int dstX0, int dstY0, int dstX1, int dstY1,
+      unsigned mask, unsigned filter);
+  virtual void renderbufferStorageMultisampleCHROMIUM(
+      unsigned long target, int samples, unsigned internalformat,
+      unsigned width, unsigned height);
+
   virtual unsigned createCompositorTexture(unsigned width, unsigned height);
   virtual void deleteCompositorTexture(unsigned parent_texture);
   virtual void copyTextureToCompositor(unsigned texture,