content: Add ContextProviderFactory to create a render ContextProvider.

content/browser/browser_main_loop.cc

 // Copyright (c) 2012 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 "content/browser/browser_main_loop.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 93 matching lines @@
 #include "ui/aura/env.h"
 #endif
 
 #if defined(OS_ANDROID)
 #include "base/android/jni_android.h"
 #include "components/tracing/common/graphics_memory_dump_provider_android.h"
 #include "content/browser/android/browser_startup_controller.h"
 #include "content/browser/android/browser_surface_texture_manager.h"
 #include "content/browser/android/tracing_controller_android.h"
 #include "content/browser/media/android/browser_media_player_manager.h"
+#include "content/browser/renderer_host/context_provider_factory_impl_android.h"
 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
 #include "content/public/browser/screen_orientation_provider.h"
 #include "gpu/ipc/client/android/in_process_surface_texture_manager.h"
 #include "media/base/android/media_client_android.h"
+#include "ui/android/context_provider_factory.h"

[no sievers, 2016/07/29 19:14:30]

nit: not needed for base class

 #include "ui/gl/gl_surface.h"
 #endif
 
 #if defined(OS_MACOSX)
 #include "base/memory/memory_pressure_monitor_mac.h"
 #include "content/browser/bootstrap_sandbox_manager_mac.h"
 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
 #include "content/browser/mach_broker_mac.h"
 #include "content/browser/renderer_host/browser_compositor_view_mac.h"
 #include "content/browser/theme_helper_mac.h"
@@ skipping 1099 matching lines @@
   }
 #endif
 
   bool always_uses_gpu = true;
   bool established_gpu_channel = false;
 #if defined(OS_ANDROID)
   // TODO(crbug.com/439322): This should be set to |true|.
   established_gpu_channel = false;
   always_uses_gpu = ShouldStartGpuProcessOnBrowserStartup();
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
+  ui::ContextProviderFactory::SetInstance(
+      ContextProviderFactoryImpl::GetInstance());

[no sievers, 2016/07/29 19:14:30]

do we leak this?

Can you unset it somewhere around where we also do
ImageTransportFactory::Terminate() in this file?

[Khushal, 2016/07/29 21:30:55]

The singleton would still remain with the ContextProviderFactoryImpl right? I
was following a pattern similar to DiscardableMemoryAllocator.

[no sievers, 2016/07/29 21:42:41]

sounds good

 #elif defined(USE_AURA) || defined(OS_MACOSX)
   established_gpu_channel = true;
   if (!GpuDataManagerImpl::GetInstance()->CanUseGpuBrowserCompositor() ||
       parsed_command_line_.HasSwitch(switches::kDisableGpuEarlyInit) ||
       shell::ShellIsRemote()) {
     established_gpu_channel = always_uses_gpu = false;
   }
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
   ImageTransportFactory::Initialize();
 #if defined(USE_AURA)
@@ skipping 271 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner =
         audio_thread_->task_runner();
     audio_manager_ = media::AudioManager::Create(std::move(audio_task_runner),
                                                  std::move(worker_task_runner),
                                                  MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 }
 
 }  // namespace content