content: Add command line flag for native GPU memory buffers.

content/browser/gpu/browser_gpu_channel_host_factory.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/gpu/browser_gpu_channel_host_factory.h"
 
+#include <set>
+
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/tracked_objects.h"
 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/child_process_host_impl.h"
@@ skipping 12 matching lines @@
 
 #if defined(OS_ANDROID)
 #include "content/common/gpu/gpu_memory_buffer_factory_surface_texture.h"
 #endif
 
 #if defined(USE_OZONE)
 #include "content/common/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h"
 #endif
 
 namespace content {
+namespace {
+
+base::LazyInstance<std::set<gfx::GpuMemoryBuffer::Usage>>
+    g_enabled_gpu_memory_buffer_usages;
+}
 
 BrowserGpuChannelHostFactory* BrowserGpuChannelHostFactory::instance_ = NULL;
 
 struct BrowserGpuChannelHostFactory::CreateRequest {
   CreateRequest(int32 route_id)
       : event(true, false),
         gpu_host_id(0),
         route_id(route_id),
         result(CREATE_COMMAND_BUFFER_FAILED) {}
   ~CreateRequest() {}
@@ skipping 176 matching lines @@
                                    base::Closure());
   }
 }
 
 void BrowserGpuChannelHostFactory::Terminate() {
   DCHECK(instance_);
   delete instance_;
   instance_ = NULL;
 }
 
+// static
+void BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
+    gfx::GpuMemoryBuffer::Usage usage) {
+  g_enabled_gpu_memory_buffer_usages.Get().insert(usage);
+}
+
+// static
+bool BrowserGpuChannelHostFactory::IsGpuMemoryBufferFactoryUsageEnabled(
+    gfx::GpuMemoryBuffer::Usage usage) {
+  return g_enabled_gpu_memory_buffer_usages.Get().count(usage) != 0;
+}
+
 BrowserGpuChannelHostFactory::BrowserGpuChannelHostFactory()
     : gpu_client_id_(ChildProcessHostImpl::GenerateChildProcessUniqueId()),
       shutdown_event_(new base::WaitableEvent(true, false)),
       gpu_memory_buffer_manager_(
           new BrowserGpuMemoryBufferManager(this, gpu_client_id_)),
       gpu_host_id_(0),
       next_create_gpu_memory_buffer_request_id_(0) {
 }
 
 BrowserGpuChannelHostFactory::~BrowserGpuChannelHostFactory() {
@@ skipping 176 matching lines @@
   GetIOLoopProxy()->PostTask(
       FROM_HERE,
       base::Bind(&BrowserGpuChannelHostFactory::AddFilterOnIO,
                  gpu_host_id_,
                  filter));
 }
 
 bool BrowserGpuChannelHostFactory::IsGpuMemoryBufferConfigurationSupported(
     gfx::GpuMemoryBuffer::Format format,
     gfx::GpuMemoryBuffer::Usage usage) {
+  // Return early if usage is not enabled.
+  if (IsGpuMemoryBufferFactoryUsageEnabled(usage))
+    return false;
+
   // Preferred type is always used by factory.
   std::vector<gfx::GpuMemoryBufferType> supported_types;
   GpuMemoryBufferFactory::GetSupportedTypes(&supported_types);
   DCHECK(!supported_types.empty());
   switch (supported_types[0]) {
     case gfx::SHARED_MEMORY_BUFFER:
       // Shared memory buffers must be created in-process.
       return false;
 #if defined(OS_MACOSX)
     case gfx::IO_SURFACE_BUFFER:
@@ skipping 78 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   CreateGpuMemoryBufferCallbackMap::iterator iter =
       create_gpu_memory_buffer_requests_.find(request_id);
   DCHECK(iter != create_gpu_memory_buffer_requests_.end());
   iter->second.Run(handle);
   create_gpu_memory_buffer_requests_.erase(iter);
 }
 
 }  // namespace content