Add PERSISTENT_MAP usage for GpuMemoryBuffers.

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 14006ce388f2c59fd6e83ec6256919e5f01b3bba..e3092f8cb1951e0d34d5efba560f4d86be0a475d 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1137,10 +1137,21 @@ static void AppendCompositorCommandLineFlags(base::CommandLine* command_line) {
   if (IsForceGpuRasterizationEnabled())
     command_line->AppendSwitch(switches::kForceGpuRasterization);
 
+  // TODO(reveman): We currently assume that the compositor will use BGRA_8888
+  // if it's able to, and RGBA_8888 otherwise. Since we don't know what it will
+  // use we hardcode BGRA_8888 here for now. We should instead move decisions
+  // about GpuMemoryBuffer format to the browser embedder so we know it here,
+  // and pass that decision to the compositor.
+  gfx::GpuMemoryBuffer::Format format = gfx::GpuMemoryBuffer::BGRA_8888;
+
+  command_line->AppendSwitchASCII(
+      switches::kMapImageTextureTarget,
+      base::UintToString(BrowserGpuChannelHostFactory::GetImageTextureTarget(
+          format, gfx::GpuMemoryBuffer::MAP)));
   command_line->AppendSwitchASCII(
-      switches::kUseImageTextureTarget,
-      base::UintToString(
-          BrowserGpuChannelHostFactory::GetImageTextureTarget()));
+      switches::kPersistentMapImageTextureTarget,
+      base::UintToString(BrowserGpuChannelHostFactory::GetImageTextureTarget(
+          format, gfx::GpuMemoryBuffer::PERSISTENT_MAP)));
 
   // Appending disable-gpu-feature switches due to software rendering list.
   GpuDataManagerImpl* gpu_data_manager = GpuDataManagerImpl::GetInstance();