Revert of Re-land: cc: Use worker context for one-copy tile initialization.

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 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/compositor/gpu_process_transport_factory.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 223 matching lines @@
   if (num_attempts > kNumRetriesBeforeSoftwareFallback) {
 #if defined(OS_CHROMEOS)
     LOG(FATAL) << "Unable to create a UI graphics context, and cannot use "
                << "software compositing on ChromeOS.";
 #endif
     create_gpu_output_surface = false;
   }
 
   scoped_refptr<ContextProviderCommandBuffer> context_provider;
   if (create_gpu_output_surface) {
-    // Try to reuse existing worker context provider.
-    if (shared_worker_context_provider_) {
-      base::AutoLock lock(*shared_worker_context_provider_->GetLock());
-      if (shared_worker_context_provider_->ContextGL()
-              ->GetGraphicsResetStatusKHR() != GL_NO_ERROR)
-        shared_worker_context_provider_ = nullptr;
-    }
     scoped_refptr<GpuChannelHost> gpu_channel_host =
         BrowserGpuChannelHostFactory::instance()->GetGpuChannel();
     if (gpu_channel_host.get()) {
       context_provider = ContextProviderCommandBuffer::Create(
           GpuProcessTransportFactory::CreateContextCommon(gpu_channel_host,
                                                           data->surface_id),
           BROWSER_COMPOSITOR_ONSCREEN_CONTEXT);
       if (context_provider && !context_provider->BindToCurrentThread())
         context_provider = nullptr;
-      if (!shared_worker_context_provider_) {
-        shared_worker_context_provider_ = ContextProviderCommandBuffer::Create(
-            GpuProcessTransportFactory::CreateContextCommon(gpu_channel_host,
-                                                            0),
-            BROWSER_WORKER_CONTEXT);
-        if (shared_worker_context_provider_ &&
-            !shared_worker_context_provider_->BindToCurrentThread())
-          shared_worker_context_provider_ = nullptr;
-      }
     }
 
-    bool created_gpu_browser_compositor =
-        !!context_provider && !!shared_worker_context_provider_;
+    UMA_HISTOGRAM_BOOLEAN("Aura.CreatedGpuBrowserCompositor",
+                          !!context_provider.get());
 
-    UMA_HISTOGRAM_BOOLEAN("Aura.CreatedGpuBrowserCompositor",
-                          created_gpu_browser_compositor);
-
-    if (!created_gpu_browser_compositor) {
+    if (!context_provider) {
       // Try again.
       CauseForGpuLaunch cause =
           CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE;
       BrowserGpuChannelHostFactory::instance()->EstablishGpuChannel(
           cause, base::Bind(&GpuProcessTransportFactory::EstablishedGpuChannel,
                             callback_factory_.GetWeakPtr(), compositor,
                             create_gpu_output_surface, num_attempts + 1));
       return;
     }
   }
 
   scoped_ptr<BrowserCompositorOutputSurface> surface;
   if (!create_gpu_output_surface) {
     surface = make_scoped_ptr(new SoftwareBrowserCompositorOutputSurface(
         CreateSoftwareOutputDevice(compositor.get()),
         compositor->vsync_manager()));
   } else {
     DCHECK(context_provider);
     ContextProvider::Capabilities capabilities =
         context_provider->ContextCapabilities();
     if (!data->surface_id) {
       surface = make_scoped_ptr(new OffscreenBrowserCompositorOutputSurface(
-          context_provider, shared_worker_context_provider_,
-          compositor->vsync_manager(),
+          context_provider, compositor->vsync_manager(),
           scoped_ptr<BrowserCompositorOverlayCandidateValidator>()));
     } else if (capabilities.gpu.surfaceless) {
       GLenum target = GL_TEXTURE_2D;
       GLenum format = GL_RGB;
 #if defined(OS_MACOSX)
       target = GL_TEXTURE_RECTANGLE_ARB;
       format = GL_BGRA_EXT;
 #endif
       surface =
           make_scoped_ptr(new GpuSurfacelessBrowserCompositorOutputSurface(
-              context_provider, shared_worker_context_provider_,
-              data->surface_id, compositor->vsync_manager(),
+              context_provider, data->surface_id, compositor->vsync_manager(),
               CreateOverlayCandidateValidator(compositor->widget()), target,
               format, BrowserGpuMemoryBufferManager::current()));
     } else {
       if (!surface) {
         surface = make_scoped_ptr(new GpuBrowserCompositorOutputSurface(
-            context_provider, shared_worker_context_provider_,
-            compositor->vsync_manager(),
+            context_provider, compositor->vsync_manager(),
             CreateOverlayCandidateValidator(compositor->widget())));
       }
     }
   }
 
   // TODO(piman): Use GpuSurfaceTracker to map ids to surfaces instead of an
   // output_surface_map_ here.
   output_surface_map_.AddWithID(surface.get(), data->surface_id);
   data->surface = surface.get();
   if (data->reflector)
@@ skipping 10 matching lines @@
   // SurfaceDisplayOutputSurface set up to draw to the display's surface.
   cc::SurfaceManager* manager = surface_manager_.get();
   scoped_ptr<cc::OnscreenDisplayClient> display_client(
       new cc::OnscreenDisplayClient(
           surface.Pass(), manager, HostSharedBitmapManager::current(),
           BrowserGpuMemoryBufferManager::current(),
           compositor->GetRendererSettings(), compositor->task_runner()));
 
   scoped_ptr<cc::SurfaceDisplayOutputSurface> output_surface(
       new cc::SurfaceDisplayOutputSurface(
-          manager, compositor->surface_id_allocator(), context_provider,
-          shared_worker_context_provider_));
+          manager, compositor->surface_id_allocator(), context_provider));
   display_client->set_surface_output_surface(output_surface.get());
   output_surface->set_display_client(display_client.get());
   display_client->display()->Resize(compositor->size());
   data->display_client = display_client.Pass();
   compositor->SetOutputSurface(output_surface.Pass());
 }
 
 scoped_ptr<ui::Reflector> GpuProcessTransportFactory::CreateReflector(
     ui::Compositor* source_compositor,
     ui::Layer* target_layer) {
@@ skipping 259 matching lines @@
   FOR_EACH_OBSERVER(ImageTransportFactoryObserver,
                     observer_list_,
                     OnLostResources());
 
   // Kill things that use the shared context before killing the shared context.
   lost_gl_helper.reset();
   lost_shared_main_thread_contexts  = NULL;
 }
 
 }  // namespace content