Added supported formats caching to VideoCaptureManager.

media/video/capture/fake_video_capture_device.h

Index: media/video/capture/fake_video_capture_device.h
diff --git a/media/video/capture/fake_video_capture_device.h b/media/video/capture/fake_video_capture_device.h
index de1fe3224458c0c50f782a148a760d866da80ee4..5397208c0bcafd6d4845526ff04f63678dc067df 100644
--- a/media/video/capture/fake_video_capture_device.h
+++ b/media/video/capture/fake_video_capture_device.h
@@ -25,10 +25,11 @@ class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
   // return NULL;
   static void SetFailNextCreate();
   static void SetNumberOfFakeDevices(size_t number_of_devices);
+  static int NumberOfFakeDevices();
 
   static void GetDeviceNames(Names* device_names);
   static void GetDeviceSupportedFormats(const Name& device,
-                                        VideoCaptureCapabilities* formats);
+                                        VideoCaptureFormats* supported_formats);
 
   // VideoCaptureDevice implementation.
   virtual void AllocateAndStart(const VideoCaptureParams& params,
@@ -47,9 +48,6 @@ class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
 
   // Called on the capture_thread_.
   void OnCaptureTask();
-
-  // EXPERIMENTAL, similar to allocate, but changes resolution and calls
-  // client->OnFrameInfoChanged(VideoCaptureCapability&)
   void Reallocate();
   void PopulateFormatRoster();
 
@@ -65,6 +63,7 @@ class MEDIA_EXPORT FakeVideoCaptureDevice : public VideoCaptureDevice {
   std::vector<VideoCaptureFormat> format_roster_;
   int format_roster_index_;
 
+  static int number_of_fake_devices_;
   static bool fail_next_create_;
   // |number_of_devices_| is atomic since tests can call SetNumberOfFakeDevices
   // on the IO thread to set |number_of_devices_|. The variable can be