Support external buffer import in VDA interface and add a V4L2SVDA impl.

content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.cc

Index: content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.cc
diff --git a/content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.cc b/content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.cc
index 04ab770fa89ab44f6cb792af2069eb3c66d69d01..261cd12d73a7ac96b047b97089882da53c374310 100644
--- a/content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.cc
+++ b/content/common/gpu/media/gpu_video_decode_accelerator_factory_impl.cc
@@ -29,13 +29,6 @@
 
 namespace content {
 
-namespace {
-static base::WeakPtr<gpu::gles2::GLES2Decoder> GetEmptyGLES2Decoder() {
-  NOTREACHED() << "VDA requests a GLES2Decoder, but client did not provide it";
-  return base::WeakPtr<gpu::gles2::GLES2Decoder>();
-}
-}
-
 // static
 scoped_ptr<GpuVideoDecodeAcceleratorFactoryImpl>
 GpuVideoDecodeAcceleratorFactoryImpl::Create(
@@ -44,7 +37,7 @@ GpuVideoDecodeAcceleratorFactoryImpl::Create(
     const BindGLImageCallback& bind_image_cb) {
   return make_scoped_ptr(new GpuVideoDecodeAcceleratorFactoryImpl(
       get_gl_context_cb, make_context_current_cb, bind_image_cb,
-      base::Bind(&GetEmptyGLES2Decoder)));
+      GetGLES2DecoderCallback()));
 }
 
 // static
@@ -60,6 +53,13 @@ GpuVideoDecodeAcceleratorFactoryImpl::CreateWithGLES2Decoder(
 }
 
 // static
+scoped_ptr<GpuVideoDecodeAcceleratorFactoryImpl>
+GpuVideoDecodeAcceleratorFactoryImpl::CreateWithNoGL() {
+  return Create(GetGLContextCallback(), MakeGLContextCurrentCallback(),
+                BindGLImageCallback());
+}
+
+// static
 gpu::VideoDecodeAcceleratorCapabilities
 GpuVideoDecodeAcceleratorFactoryImpl::GetDecoderCapabilities(
     const gpu::GpuPreferences& gpu_preferences) {