Add support for GL_EXT_multisampled_render_to_texture.

src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp

 // Modified from chromium/src/webkit/glue/gl_bindings_skia_cmd_buffer.cc
 
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "gl/GrGLExtensions.h"
 #include "gl/GrGLInterface.h"
 
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES
 #endif
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include <EGL/egl.h>
 
 const GrGLInterface* GrGLCreateNativeInterface() {
     static SkAutoTUnref<GrGLInterface> glInterface;
     if (!glInterface.get()) {
+        GrGLExtensions extensions;
+        if (!extensions.init(kES2_GrGLBinding, glGetString, NULL, glGetIntegerv)) {
+            return NULL;
+        }
         GrGLInterface* interface = new GrGLInterface;
         glInterface.reset(interface);
         interface->fBindingsExported = kES2_GrGLBinding;
         interface->fActiveTexture = glActiveTexture;
         interface->fAttachShader = glAttachShader;
         interface->fBindAttribLocation = glBindAttribLocation;
         interface->fBindBuffer = glBindBuffer;
         interface->fBindTexture = glBindTexture;
         interface->fBindVertexArray = glBindVertexArrayOES;
         interface->fBlendColor = glBlendColor;
@@ skipping 90 matching lines @@
         interface->fVertexAttrib4fv = glVertexAttrib4fv;
         interface->fVertexAttribPointer = glVertexAttribPointer;
         interface->fViewport = glViewport;
         interface->fBindFramebuffer = glBindFramebuffer;
         interface->fBindRenderbuffer = glBindRenderbuffer;
         interface->fCheckFramebufferStatus = glCheckFramebufferStatus;
         interface->fDeleteFramebuffers = glDeleteFramebuffers;
         interface->fDeleteRenderbuffers = glDeleteRenderbuffers;
         interface->fFramebufferRenderbuffer = glFramebufferRenderbuffer;
         interface->fFramebufferTexture2D = glFramebufferTexture2D;
+        if (extensions.has("GL_EXT_multisampled_render_to_texture")) {
+#if GL_EXT_multisampled_render_to_texture
+            interface->fFramebufferTexture2DMultisample = glFramebufferTexture2DMultisampleEXT;
+            interface->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleEXT;
+#else
+            interface->fFramebufferTexture2DMultisample = (GrGLFramebufferTexture2DMultisampleProc) eglGetProcAddress("glFramebufferTexture2DMultisampleEXT");
+            interface->fRenderbufferStorageMultisample = (GrGLRenderbufferStorageMultisampleProc) eglGetProcAddress("glRenderbufferStorageMultisampleEXT");
+#endif
+        } else if (extensions.has("GL_IMG_multisampled_render_to_texture")) {
 #if GL_IMG_multisampled_render_to_texture
-        interface->fFramebufferTexture2DMultisample = glFramebufferTexture2DMultisampleIMG;
-        interface->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleIMG;
+            interface->fFramebufferTexture2DMultisample = glFramebufferTexture2DMultisampleIMG;
+            interface->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleIMG;
+#else
+            interface->fFramebufferTexture2DMultisample = (GrGLFramebufferTexture2DMultisampleProc) eglGetProcAddress("glFramebufferTexture2DMultisampleIMG");
+            interface->fRenderbufferStorageMultisample = (GrGLRenderbufferStorageMultisampleProc) eglGetProcAddress("glRenderbufferStorageMultisampleIMG");
 #endif
+        }
         interface->fGenFramebuffers = glGenFramebuffers;
         interface->fGenRenderbuffers = glGenRenderbuffers;
         interface->fGetFramebufferAttachmentParameteriv = glGetFramebufferAttachmentParameteriv;
         interface->fGetRenderbufferParameteriv = glGetRenderbufferParameteriv;
         interface->fRenderbufferStorage = glRenderbufferStorage;
 #if GL_OES_mapbuffer
         interface->fMapBuffer = glMapBufferOES;
         interface->fUnmapBuffer = glUnmapBufferOES;
 #else
         interface->fMapBuffer = (GrGLMapBufferProc) eglGetProcAddress("glMapBufferOES");
         interface->fUnmapBuffer = (GrGLUnmapBufferProc) eglGetProcAddress("glUnmapBufferOES");
 #endif
     }
     glInterface.get()->ref();
     return glInterface.get();
 }