Make it possible to use OSMesa on Android

gpu/command_buffer/service/async_pixel_transfer_manager_android.cc

 // Copyright 2013 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 "gpu/command_buffer/service/async_pixel_transfer_manager.h"
 
 #include "base/android/sys_utils.h"
 #include "base/debug/trace_event.h"
 #include "gpu/command_buffer/service/async_pixel_transfer_manager_egl.h"
 #include "gpu/command_buffer/service/async_pixel_transfer_manager_idle.h"
@@ skipping 41 matching lines @@
           context->HasExtension("EGL_KHR_image_base") &&
           context->HasExtension("EGL_KHR_gl_texture_2D_image") &&
           context->HasExtension("GL_OES_EGL_image") &&
           !IsBroadcom() &&
           !IsImagination() &&
           !base::android::SysUtils::IsLowEndDevice()) {
         return new AsyncPixelTransferManagerEGL;
       }
       LOG(INFO) << "Async pixel transfers not supported";
       return new AsyncPixelTransferManagerIdle;
+    case gfx::kGLImplementationOSMesaGL:
+      return new AsyncPixelTransferManagerIdle;
     case gfx::kGLImplementationMockGL:
       return new AsyncPixelTransferManagerStub;
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace gpu