Adds MediaClientAndroid to support embedder/MediaDrmBridge interaction.

android_webview/browser/aw_browser_main_parts.cc

Index: android_webview/browser/aw_browser_main_parts.cc
diff --git a/android_webview/browser/aw_browser_main_parts.cc b/android_webview/browser/aw_browser_main_parts.cc
index be793ee8c0ba0fe2c311afd1b46e0e092eb00bac..753a5e49f329bcabed04a5cd0236afb7ba01d084 100644
--- a/android_webview/browser/aw_browser_main_parts.cc
+++ b/android_webview/browser/aw_browser_main_parts.cc
@@ -6,7 +6,9 @@
 
 #include "android_webview/browser/aw_browser_context.h"
 #include "android_webview/browser/aw_dev_tools_discovery_provider.h"
+#include "android_webview/browser/aw_media_client_android.h"
 #include "android_webview/browser/aw_result_codes.h"
+#include "android_webview/common/aw_resource.h"
 #include "android_webview/native/public/aw_assets.h"
 #include "base/android/build_info.h"
 #include "base/android/locale_utils.h"
@@ -19,6 +21,7 @@
 #include "content/public/common/content_switches.h"
 #include "content/public/common/result_codes.h"
 #include "content/public/common/url_utils.h"
+#include "media/base/android/media_client_android.h"
 #include "net/android/network_change_notifier_factory_android.h"
 #include "net/base/network_change_notifier.h"
 #include "ui/base/l10n/l10n_util.h"
@@ -100,6 +103,9 @@ void AwBrowserMainParts::PreMainMessageLoopRun() {
   discovery_manager->AddProvider(make_scoped_ptr(
       new AwDevToolsDiscoveryProvider()));
 
+  media::SetMediaClientAndroid(
+      new AwMediaClientAndroid(AwResource::GetConfigKeySystemUuidMapping()));
+
   // This is needed for WebView Classic backwards compatibility
   // See crbug.com/298495
   content::SetMaxURLChars(20 * 1024 * 1024);