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

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 463a9b5b558ba4a8c3cda087449756dbe602944e..37875eb70f2492ec84d391fc0e50b63250fdbc03 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -50,6 +50,7 @@
 #include "content/browser/fileapi/fileapi_message_filter.h"
 #include "content/browser/frame_host/render_frame_message_filter.h"
 #include "content/browser/geofencing/geofencing_dispatcher_host.h"
+#include "content/browser/gpu/browser_gpu_channel_host_factory.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "content/browser/gpu/gpu_process_host.h"
@@ -105,6 +106,7 @@
 #include "content/common/child_process_host_impl.h"
 #include "content/common/child_process_messages.h"
 #include "content/common/content_switches_internal.h"
+#include "content/common/gpu/gpu_memory_buffer_factory.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/mojo/mojo_messages.h"
 #include "content/common/resource_messages.h"
@@ -1021,6 +1023,20 @@ static void AppendCompositorCommandLineFlags(base::CommandLine* command_line) {
   if (IsForceGpuRasterizationEnabled())
     command_line->AppendSwitch(switches::kForceGpuRasterization);
 
+  if (BrowserGpuChannelHostFactory::IsGpuMemoryBufferFactoryUsageEnabled(
+          gfx::GpuMemoryBuffer::MAP)) {
+    std::vector<gfx::GpuMemoryBufferType> supported_types;
+    GpuMemoryBufferFactory::GetSupportedTypes(&supported_types);
+    DCHECK(!supported_types.empty());
+
+    // The GPU service will always use the preferred type.
+    gfx::GpuMemoryBufferType type = supported_types[0];
+
+    // Surface texture backed GPU memory buffers require TEXTURE_EXTERNAL_OES.
+    if (type == gfx::SURFACE_TEXTURE_BUFFER)
+      command_line->AppendSwitch(switches::kUseImageExternal);
+  }
+
   // Appending disable-gpu-feature switches due to software rendering list.
   GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();
   DCHECK(gpu_data_manager);