PepperPlatformAudioInputImpl: support audio input device selection.

webkit/plugins/ppapi/plugin_delegate.h

Index: webkit/plugins/ppapi/plugin_delegate.h
diff --git a/webkit/plugins/ppapi/plugin_delegate.h b/webkit/plugins/ppapi/plugin_delegate.h
index be8cd1635115d4ca2eec7df6c7f36d91c31df58e..91ee5255427c11c2d08c1441df9ae83d10fd159a 100644
--- a/webkit/plugins/ppapi/plugin_delegate.h
+++ b/webkit/plugins/ppapi/plugin_delegate.h
@@ -227,6 +227,14 @@ class PluginDelegate {
     virtual ~PlatformAudioOutput() {}
   };
 
+  class PlatformAudioInputClient : public PlatformAudioCommonClient {
+   public:
+    virtual void StreamCreationFailed() = 0;
+
+   protected:
+    virtual ~PlatformAudioInputClient() {}
+  };
+
   class PlatformAudioInput {
    public:
     // Starts the capture. Returns false on error or if called before the
@@ -348,12 +356,14 @@ class PluginDelegate {
       uint32_t sample_count,
       PlatformAudioCommonClient* client) = 0;
 
+  // If |device_id| is empty, the default audio input device will be used.
   // The caller is responsible for calling Shutdown() on the returned pointer
   // to clean up the corresponding resources allocated during this call.
   virtual PlatformAudioInput* CreateAudioInput(
+      const std::string& device_id,
       uint32_t sample_rate,
       uint32_t sample_count,
-      PlatformAudioCommonClient* client) = 0;
+      PlatformAudioInputClient* client) = 0;
 
   // A pointer is returned immediately, but it is not ready to be used until
   // BrokerConnected has been called.