Update renderable configs for ES3

src/gpu/gl/GrGpuGL.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGpuGL.h"
 #include "GrGLStencilBuffer.h"
@@ skipping 183 matching lines @@
     //  support for GL_ALPHA and ALPHA8
 
     // GL_EXT_bgra adds BGRA render targets to any version
 
     // ES 2.0
     //  color renderable: RGBA4, RGB5_A1, RGB565
     //  GL_EXT_texture_rg adds support for R8 as a color render target
     //  GL_OES_rgb8_rgba8 and/or GL_ARM_rgba8 adds support for RGBA8
     //  GL_EXT_texture_format_BGRA8888 and/or GL_APPLE_texture_format_BGRA8888 added BGRA support
 
+    // ES 3.0
+    // Same as ES 2.0 except R8 and RGBA8 are supported without extensions (the functions called
+    // below already account for this).
+
     if (kDesktop_GrGLBinding == this->glBinding()) {
         // Post 3.0 we will get R8
         // Prior to 3.0 we will get ALPHA8 (with GL_ARB_framebuffer_object)
         if (this->glVersion() >= GR_GL_VER(3,0) ||
             this->hasExtension("GL_ARB_framebuffer_object")) {
             fConfigRenderSupport[kAlpha_8_GrPixelConfig] = true;
         }
     } else {
         // On ES we can only hope for R8
         fConfigRenderSupport[kAlpha_8_GrPixelConfig] =
@@ skipping 2338 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }