Show GpuMemoryBuffer feature in chrome://gpu

content/browser/gpu/browser_gpu_memory_buffer_manager.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/gpu/browser_gpu_memory_buffer_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 138 matching lines @@
               format, gfx::BufferUsage::SCANOUT)) {
         configurations.insert(
             std::make_pair(format, gfx::BufferUsage::SCANOUT));
       }
     }
   }
 
   return configurations;
 }
 
+// TODO(vignatti): extract the commonalities with function
+// GetNativeGpuMemoryBufferConfigurations.
+GpuMemoryBufferConfigurationList GetNativeGpuMemoryBufferEnabledSupported() {
+  GpuMemoryBufferConfigurationList configurations;
+#if defined(OS_MACOSX)
+  bool enable_native_gpu_memory_buffers =
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableNativeGpuMemoryBuffers);
+#else
+  bool enable_native_gpu_memory_buffers =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableNativeGpuMemoryBuffers);
+#endif
+
+  // Disable native buffers when using Mesa.
+  if (base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          switches::kUseGL) == gfx::kGLImplementationOSMesaName) {
+    enable_native_gpu_memory_buffers = false;
+  }
+
+  if (enable_native_gpu_memory_buffers) {
+    const gfx::BufferFormat kNativeFormats[] = {
+        gfx::BufferFormat::R_8,       gfx::BufferFormat::RGBA_4444,
+        gfx::BufferFormat::RGBA_8888, gfx::BufferFormat::BGRA_8888,
+        gfx::BufferFormat::UYVY_422,  gfx::BufferFormat::YUV_420_BIPLANAR};
+    const gfx::BufferUsage kNativeUsages[] = {gfx::BufferUsage::MAP,
+                                              gfx::BufferUsage::PERSISTENT_MAP};
+    for (auto& format : kNativeFormats) {
+      for (auto& usage : kNativeUsages) {
+        if (IsNativeGpuMemoryBufferFactoryConfigurationSupported(format, usage))
+          configurations.push_back(std::make_pair(format, usage));
+      }
+    }
+  }
+
+  return configurations;
+}
+
 BrowserGpuMemoryBufferManager* g_gpu_memory_buffer_manager = nullptr;
 
 }  // namespace
 
 struct BrowserGpuMemoryBufferManager::CreateGpuMemoryBufferRequest {
   CreateGpuMemoryBufferRequest(const gfx::Size& size,
                                gfx::BufferFormat format,
                                gfx::BufferUsage usage,
                                int client_id,
                                int surface_id)
@@ skipping 27 matching lines @@
                                      0),
         handle(handle) {}
   ~CreateGpuMemoryBufferFromHandleRequest() {}
   gfx::GpuMemoryBufferHandle handle;
 };
 
 BrowserGpuMemoryBufferManager::BrowserGpuMemoryBufferManager(
     int gpu_client_id,
     uint64_t gpu_client_tracing_id)
     : native_configurations_(GetNativeGpuMemoryBufferConfigurations()),
+      native_enabled_and_supported_(GetNativeGpuMemoryBufferEnabledSupported()),
       gpu_client_id_(gpu_client_id),
       gpu_client_tracing_id_(gpu_client_tracing_id),
       gpu_host_id_(0) {
   DCHECK(!g_gpu_memory_buffer_manager);
   g_gpu_memory_buffer_manager = this;
 }
 
 BrowserGpuMemoryBufferManager::~BrowserGpuMemoryBufferManager() {
   g_gpu_memory_buffer_manager = nullptr;
 }
@@ skipping 490 matching lines @@
     return gpu_client_tracing_id_;
   }
 
   // In normal cases, |client_id| is a child process id, so we can perform
   // the standard conversion.
   return ChildProcessHostImpl::ChildProcessUniqueIdToTracingProcessId(
       client_id);
 }
 
 }  // namespace content