Make VEA client of command buffer; move sync. IPC to VDA/VEA::Initialize()

media/cast/video_sender/external_video_encoder.cc

Index: media/cast/video_sender/external_video_encoder.cc
diff --git a/media/cast/video_sender/external_video_encoder.cc b/media/cast/video_sender/external_video_encoder.cc
index 4f97dace111f4103fdf5d8c51f6cef82498083c1..78bb30932d1d0521e2b2da0089366d4bce3a26ee 100644
--- a/media/cast/video_sender/external_video_encoder.cc
+++ b/media/cast/video_sender/external_video_encoder.cc
@@ -73,8 +73,10 @@ class LocalVideoEncodeAcceleratorClient
 
     video_encode_accelerator_ =
         gpu_factories_->CreateVideoEncodeAccelerator().Pass();
-    if (!video_encode_accelerator_)
+    if (!video_encode_accelerator_) {
+      NotifyError(VideoEncodeAccelerator::kPlatformFailureError);
       return;
+    }
 
     VideoCodecProfile output_profile = media::VIDEO_CODEC_PROFILE_UNKNOWN;
     switch (video_config.codec) {
@@ -88,14 +90,20 @@ class LocalVideoEncodeAcceleratorClient
     codec_ = video_config.codec;
     max_frame_rate_ = video_config.max_frame_rate;
 
-    // Asynchronous initialization call; NotifyInitializeDone or NotifyError
-    // will be called once the HW is initialized.
-    video_encode_accelerator_->Initialize(
-        media::VideoFrame::I420,
-        gfx::Size(video_config.width, video_config.height),
-        output_profile,
-        video_config.start_bitrate,
-        this);
+    if (!video_encode_accelerator_->Initialize(
+            media::VideoFrame::I420,
+            gfx::Size(video_config.width, video_config.height),
+            output_profile,
+            video_config.start_bitrate,
+            this)) {
+      NotifyError(VideoEncodeAccelerator::kInvalidArgumentError);
+      return;
+    }
+
+    cast_environment_->PostTask(
+        CastEnvironment::MAIN,
+        FROM_HERE,
+        base::Bind(&ExternalVideoEncoder::EncoderInitialized, weak_owner_));
   }
 
   // Free the HW.
@@ -176,16 +184,6 @@ class LocalVideoEncodeAcceleratorClient
   }
 
  protected:
-  virtual void NotifyInitializeDone() OVERRIDE {
-    DCHECK(encoder_task_runner_);
-    DCHECK(encoder_task_runner_->RunsTasksOnCurrentThread());
-
-    cast_environment_->PostTask(
-        CastEnvironment::MAIN,
-        FROM_HERE,
-        base::Bind(&ExternalVideoEncoder::EncoderInitialized, weak_owner_));
-  }
-
   virtual void NotifyError(VideoEncodeAccelerator::Error error) OVERRIDE {
     DCHECK(encoder_task_runner_);
     DCHECK(encoder_task_runner_->RunsTasksOnCurrentThread());