ARC: fix the arc video playback with --mus

With recent changes, --mus has a separate viz process wich is launched by
browser process via GpuPorcessHost. So we should use GpuProcessHost to
request ARC related interfaces in Viz.

Bug: 793901
Change-Id: Idd27f95fcf962b54634876024d0da4600da3f3aa
Reviewed-on: https://chromium-review.googlesource.com/820151Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523338}

chrome/browser/chromeos/arc/video/gpu_arc_video_service_host.cc

@@ -11,7 +11,6 @@
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/threading/thread_checker.h"
-#include "chrome/browser/chromeos/ash_config.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_browser_context_keyed_service_factory_base.h"
 #include "components/arc/common/video_decode_accelerator.mojom.h"
@@ -24,6 +23,7 @@
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/ui/public/interfaces/arc.mojom.h"
 #include "services/ui/public/interfaces/constants.mojom.h"
+#include "ui/base/ui_base_switches_util.h"
 
 namespace arc {
 
@@ -50,9 +50,7 @@ class GpuArcVideoServiceHostFactory
 
 class VideoAcceleratorFactoryService : public mojom::VideoAcceleratorFactory {
  public:
-  VideoAcceleratorFactoryService() {
-    DCHECK_EQ(chromeos::GetAshConfig(), ash::Config::CLASSIC);
-  }
+  VideoAcceleratorFactoryService() { DCHECK(!switches::IsMusHostingViz()); }
 
   ~VideoAcceleratorFactoryService() override = default;
 
@@ -87,18 +85,18 @@ class VideoAcceleratorFactoryService : public mojom::VideoAcceleratorFactory {
   DISALLOW_COPY_AND_ASSIGN(VideoAcceleratorFactoryService);
 };
 
-class VideoAcceleratorFactoryServiceMus
+class VideoAcceleratorFactoryServiceViz
     : public mojom::VideoAcceleratorFactory {
  public:
-  VideoAcceleratorFactoryServiceMus() {
-    DCHECK_NE(chromeos::GetAshConfig(), ash::Config::CLASSIC);
+  VideoAcceleratorFactoryServiceViz() {
+    DCHECK(switches::IsMusHostingViz());
     DETACH_FROM_THREAD(thread_checker_);
     auto* connector =
         content::ServiceManagerConnection::GetForProcess()->GetConnector();
     connector->BindInterface(ui::mojom::kServiceName, &arc_);
   }
 
-  ~VideoAcceleratorFactoryServiceMus() override {
+  ~VideoAcceleratorFactoryServiceViz() override {
     DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
   }
 
@@ -125,14 +123,14 @@ class VideoAcceleratorFactoryServiceMus
 
   ui::mojom::ArcPtr arc_;
 
-  DISALLOW_COPY_AND_ASSIGN(VideoAcceleratorFactoryServiceMus);
+  DISALLOW_COPY_AND_ASSIGN(VideoAcceleratorFactoryServiceViz);
 };
 
 std::unique_ptr<mojom::VideoAcceleratorFactory>
 CreateVideoAcceleratorFactory() {
-  if (chromeos::GetAshConfig() == ash::Config::CLASSIC)
+  if (switches::IsMusHostingViz())
+    return std::make_unique<VideoAcceleratorFactoryServiceViz>();
   return std::make_unique<VideoAcceleratorFactoryService>();
-  return std::make_unique<VideoAcceleratorFactoryServiceMus>();
 }
 
 }  // namespace