Add an IPC to return the platform supported key-system names in Android.

components/cdm/browser/cdm_message_filter_android.h

Index: components/cdm/browser/cdm_message_filter_android.h
diff --git a/components/cdm/browser/cdm_message_filter_android.h b/components/cdm/browser/cdm_message_filter_android.h
index 47aa44507b430a3802896447a2c1334f9a410c19..a81bfdb940235ef9ff4efaac8766d19cce2729f6 100644
--- a/components/cdm/browser/cdm_message_filter_android.h
+++ b/components/cdm/browser/cdm_message_filter_android.h
@@ -19,6 +19,7 @@ class CdmMessageFilterAndroid
     : public content::BrowserMessageFilter {
  public:
   CdmMessageFilterAndroid();
+  CdmMessageFilterAndroid(const std::vector<std::string> key_systems);

[ddorwin, 2014/06/10 18:48:04]

explicit

Why do we need two constructors?

[ycheo (away), 2014/06/11 00:08:22]

I changed the code that to get key system names from MediaDrm directly.

 
  private:
   virtual ~CdmMessageFilterAndroid();
@@ -29,11 +30,15 @@ class CdmMessageFilterAndroid
       const IPC::Message& message,
       content::BrowserThread::ID* thread) OVERRIDE;
 
-  // Retrieve the supported key systems.
-  void OnGetSupportedKeySystems(
+  // Retrieve the supported key system information.
+  void OnGetSupportedKeySystem(
       const SupportedKeySystemRequest& request,
       SupportedKeySystemResponse* response);
 
+  void OnGetAllSupportedKeySystemNames(std::vector<std::string>* key_systems);
+
+  std::vector<std::string> key_systems_;
+
   DISALLOW_COPY_AND_ASSIGN(CdmMessageFilterAndroid);
 };