Show GpuMemoryBuffer feature in chrome://gpu

content/browser/gpu/browser_gpu_memory_buffer_manager.cc

Index: content/browser/gpu/browser_gpu_memory_buffer_manager.cc
diff --git a/content/browser/gpu/browser_gpu_memory_buffer_manager.cc b/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
index 1832ce5178c67a93111af9961b489f37987ee111..efc5068668db09d28055501bdf772c79db0f1b46 100644
--- a/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
+++ b/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
@@ -156,6 +156,44 @@ GpuMemoryBufferConfigurationSet GetNativeGpuMemoryBufferConfigurations() {
   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
@@ -203,6 +241,7 @@ 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) {