Encrypted Media: Implement IPC based SetCdm().

content/renderer/media/crypto/proxy_decryptor.h

Index: content/renderer/media/crypto/proxy_decryptor.h
diff --git a/content/renderer/media/crypto/proxy_decryptor.h b/content/renderer/media/crypto/proxy_decryptor.h
index 981566624055522a95e170103976719dbde9d730..ea19d9e40b3b43d7a4eb963b69a929f236b98f24 100644
--- a/content/renderer/media/crypto/proxy_decryptor.h
+++ b/content/renderer/media/crypto/proxy_decryptor.h
@@ -59,7 +59,6 @@ class ProxyDecryptor {
       const CreatePepperCdmCB& create_pepper_cdm_cb,
 #elif defined(OS_ANDROID)
       RendererMediaPlayerManager* manager,
-      int cdm_id,
 #endif  // defined(ENABLE_PEPPER_CDMS)
       const KeyAddedCB& key_added_cb,
       const KeyErrorCB& key_error_cb,
@@ -70,6 +69,10 @@ class ProxyDecryptor {
   // Decryptor is associated.
   media::Decryptor* GetDecryptor();
 
+  // Returns the CDM ID associated with this object. May be kInvalidCdmId if no
+  // CDM ID is associated.
+  int GetCdmId();
+
   // Only call this once.
   bool InitializeCDM(const std::string& key_system, const GURL& frame_url);