Implement support for using GL ES 3.0 with command buffer

src/gpu/GrContextFactory.h

Index: src/gpu/GrContextFactory.h
diff --git a/src/gpu/GrContextFactory.h b/src/gpu/GrContextFactory.h
index 7afa3108c69d8984e0d63cd76350570dc764d4be..ca4420e182d6a7d63886132e42b407b7e8d6c001 100644
--- a/src/gpu/GrContextFactory.h
+++ b/src/gpu/GrContextFactory.h
@@ -34,7 +34,9 @@ public:
         kANGLE_GL_GLContextType, //! ANGLE on OpenGL OpenGL ES context.
 #endif
 #if SK_COMMAND_BUFFER
-        kCommandBuffer_GLContextType, //! Chromium command buffer OpenGL ES context.
+        kCommandBufferES2_GLContextType, //! Chromium command buffer OpenGL ES 2.0 context.
+        kCommandBufferES3_GLContextType, //! Chromium command buffer OpenGL ES 3.0 context.
+                                         //! Not ready for production.
 #endif
 #if SK_MESA
         kMESA_GLContextType,  //! MESA OpenGL context
@@ -82,8 +84,10 @@ public:
                 return "angle-gl";
 #endif
 #if SK_COMMAND_BUFFER
-            case kCommandBuffer_GLContextType:
+            case kCommandBufferES2_GLContextType:
                 return "commandbuffer";
+            case kCommandBufferES3_GLContextType:
+                return "commandbuffer3";
 #endif
 #if SK_MESA
             case kMESA_GLContextType: