Make PPB_GLESChromiumTextureMapping_Dev work with PPB_Graphics3D_Dev

ppapi/thunk/ppb_gles_chromium_texture_mapping_thunk.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 "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_context_3d_api.h"
+#include "ppapi/thunk/ppb_graphics_3d_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 
 namespace ppapi {
 namespace thunk {
 
 namespace {
 
 typedef EnterResource<PPB_Context3D_API> EnterContext3D;
+typedef EnterResource<PPB_Graphics3D_API> EnterGraphics3D;
 
 void* MapTexSubImage2DCHROMIUM(PP_Resource context,
                                GLenum target,
                                GLint level,
                                GLint xoffset,
                                GLint yoffset,
                                GLsizei width,
                                GLsizei height,
                                GLenum format,
                                GLenum type,
                                GLenum access) {
-  EnterContext3D enter(context, true);
-  if (enter.failed())
-    return NULL;
-  return enter.object()->MapTexSubImage2DCHROMIUM(
-      target, level, xoffset, yoffset, width, height, format, type, access);
+  {
+    EnterContext3D enter(context, false);
+    if (enter.succeeded()) {
+      return enter.object()->MapTexSubImage2DCHROMIUM(
+          target, level, xoffset, yoffset, width, height, format, type, access);
+    }
+  }
+  {
+    EnterGraphics3D enter(context, true);
+    if (enter.succeeded()) {
+      return enter.object()->MapTexSubImage2DCHROMIUM(
+          target, level, xoffset, yoffset, width, height, format, type, access);
+    }
+  }
+  return NULL;
 }
 
 void UnmapTexSubImage2DCHROMIUM(PP_Resource context, const void* mem) {
-  EnterContext3D enter(context, true);
-  if (enter.succeeded())
-    enter.object()->UnmapTexSubImage2DCHROMIUM(mem);
+  {
+    EnterContext3D enter(context, false);
+    if (enter.succeeded()) {
+      enter.object()->UnmapTexSubImage2DCHROMIUM(mem);
+      return;
+    }
+  }
+  {
+    EnterGraphics3D enter(context, true);
+    if (enter.succeeded()) {
+      enter.object()->UnmapTexSubImage2DCHROMIUM(mem);
+      return;
+    }
+  }
 }
 
 const PPB_GLESChromiumTextureMapping_Dev
 g_ppb_gles_chromium_texture_mapping_thunk = {
   &MapTexSubImage2DCHROMIUM,
   &UnmapTexSubImage2DCHROMIUM
 };
 
 }  // namespace
 
 const PPB_GLESChromiumTextureMapping_Dev*
 GetPPB_GLESChromiumTextureMapping_Thunk() {
   return &g_ppb_gles_chromium_texture_mapping_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi