[WIP] Proxy RtcVideoDecoder calls to a media::VideoDecoder.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index fba5aa2b40f57787e45b8ece9b2b59b3f6c0de4a..5cd1d61b0115d5bb0253ee2d0955ca27d45a6231 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -381,8 +381,40 @@ using extensions::Manifest;
 using plugins::ChromeContentBrowserClientPluginsPart;
 #endif
 
+#include "media/filters/ffmpeg_video_decoder.h"
+#include "media/mojo/interfaces/video_decoder.mojom.h"
+#include "media/mojo/services/mojo_media_client.h"
+#include "media/mojo/services/mojo_video_decoder_service.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
 namespace {
 
+/////////////// DEBUG //////////////////////////////////////////////////////////
+// This MojoMediaClient is only good for one thing: creating FFmpegVideoDecoders
+class FFmpegMojoMediaClient : public media::MojoMediaClient {
+ public:
+  FFmpegMojoMediaClient() {}
+  ~FFmpegMojoMediaClient() override {}
+
+  // media::MojoMediaClient implementation:
+  std::unique_ptr<media::VideoDecoder> CreateVideoDecoder(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner) override {
+    return base::MakeUnique<media::FFmpegVideoDecoder>();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FFmpegMojoMediaClient);
+};
+
+static void CreateVideoDecoder(media::mojom::VideoDecoderRequest request) {
+  // Note(slan): Just leak the client for now.
+  mojo::MakeStrongBinding<::media::mojom::VideoDecoder>(
+      base::MakeUnique<::media::MojoVideoDecoderService>(
+          new FFmpegMojoMediaClient()),
+      std::move(request));
+}
+/////////////// DEBUG //////////////////////////////////////////////////////////
+
 // Cached version of the locale so we can return the locale on the I/O
 // thread.
 base::LazyInstance<std::string> g_io_thread_application_locale;
@@ -2938,6 +2970,7 @@ void ChromeContentBrowserClient::ExposeInterfacesToRenderer(
   registry->AddInterface(
       base::Bind(&BudgetServiceImpl::Create, render_process_host->GetID()),
       ui_task_runner);
+  registry->AddInterface(base::Bind(&CreateVideoDecoder));
 
 #if defined(OS_CHROMEOS)
   registry->AddInterface<metrics::mojom::LeakDetector>(