Add support for ES3 MSAA.

include/gpu/gl/GrGLConfig.h

Index: include/gpu/gl/GrGLConfig.h
===================================================================
--- include/gpu/gl/GrGLConfig.h	(revision 10891)
+++ include/gpu/gl/GrGLConfig.h	(working copy)
@@ -162,6 +162,16 @@
     #define GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE       0
 #endif
 
+// We now have a separate GrGLInterface function pointer entry for the IMG/EXT version of

[robertphillips, 2013/08/23 17:25:34]

setting setting -> setting

[bsalomon, 2013/08/23 17:28:49]

will do

+// glRenderbufferStorageMultisampled. However, Chrome is setting setting the one we now
+// now use for ES3 MSAA to point to the IMG/EXT function. This macro exists to make
+// Skia ignore the presence of ES3 MSAA and instead use the IMG/EXT version with the
+// old function pointer entry. It will be removed as soon as Chrome is updated to 
+// set the new function pointer.
+#if !defined(GR_GL_IGNORE_ES3_MSAA)
+    #define GR_GL_IGNORE_ES3_MSAA 0
+#endif
+
 /**
  * There is a strange bug that occurs on Macs with NVIDIA GPUs. We don't
  * fully understand it. When (element) array buffers are continually