Fix V4L2VideoEncodeAccelerator is not enabled in GN build

media/gpu/ipc/service/gpu_video_encode_accelerator.cc

Index: media/gpu/ipc/service/gpu_video_encode_accelerator.cc
diff --git a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
index dc4e51591bd843e8e2d8486bf12f5d967bf21046..f5be7729a88b8dbf8facd858a8b0634dfc5f1b5b 100644
--- a/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
+++ b/media/gpu/ipc/service/gpu_video_encode_accelerator.cc
@@ -25,7 +25,7 @@
 #include "media/gpu/ipc/common/media_messages.h"
 
 #if defined(OS_CHROMEOS)
-#if defined(USE_V4L2_CODEC)
+#if defined(ARCH_CPU_ARMEL) || (defined(USE_OZONE) && defined(USE_V4L2_CODEC))
 #include "media/gpu/v4l2_video_encode_accelerator.h"
 #endif
 #if defined(ARCH_CPU_X86_FAMILY)
@@ -194,7 +194,9 @@ std::vector<GpuVideoEncodeAccelerator::CreateVEAFp>
 GpuVideoEncodeAccelerator::CreateVEAFps(
     const gpu::GpuPreferences& gpu_preferences) {
   std::vector<GpuVideoEncodeAccelerator::CreateVEAFp> create_vea_fps;
-#if defined(OS_CHROMEOS) && defined(USE_V4L2_CODEC)
+
+#if defined(OS_CHROMEOS) && (defined(ARCH_CPU_ARMEL) || \
+                             (defined(USE_OZONE) && defined(USE_V4L2_CODEC)))

[wuchengli, 2016/07/12 11:39:51]

This is not directly related to gn change. Please separate
gpu_video_encode_accelerator.h/gpu_video_encode_accelerator.cc to another CL.

   create_vea_fps.push_back(&GpuVideoEncodeAccelerator::CreateV4L2VEA);
 #endif
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY)
@@ -211,7 +213,8 @@ GpuVideoEncodeAccelerator::CreateVEAFps(
   return create_vea_fps;
 }
 
-#if defined(OS_CHROMEOS) && defined(USE_V4L2_CODEC)
+#if defined(OS_CHROMEOS) && (defined(ARCH_CPU_ARMEL) || \
+                             (defined(USE_OZONE) && defined(USE_V4L2_CODEC)))
 // static
 std::unique_ptr<VideoEncodeAccelerator>
 GpuVideoEncodeAccelerator::CreateV4L2VEA() {