Pepper: Add IsAvailable() static methods to C++ wrappers to AudioInput_Dev and VideoCapture_Dev.

Review URL: http://codereview.chromium.org/8566044

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110758 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/cpp/dev/audio_input_dev.cc

@@ -31,6 +31,11 @@ AudioInput_Dev::AudioInput_Dev(Instance* instance,
   }
 }
 
+// static
+bool AudioInput_Dev::IsAvailable() {
+  return has_interface<PPB_AudioInput_Dev>();
+}
+
 bool AudioInput_Dev::StartCapture() {
   return has_interface<PPB_AudioInput_Dev>() &&
       get_interface<PPB_AudioInput_Dev>()->StartCapture(pp_resource());

ppapi/cpp/dev/audio_input_dev.h

@@ -23,6 +23,12 @@ class AudioInput_Dev : public Resource {
                  PPB_AudioInput_Callback callback,
                  void* user_data);
 
+  /// Static function for determining whether the browser supports the required
+  /// AudioInput interface.
+  ///
+  /// @return true if the interface is available, false otherwise.
+  static bool IsAvailable();
+
   /// Getter function for returning the internal <code>PPB_AudioConfig</code>
   /// struct.
   ///

ppapi/cpp/dev/video_capture_dev.cc

@@ -34,6 +34,11 @@ VideoCapture_Dev::VideoCapture_Dev(const VideoCapture_Dev& other)
     : Resource(other) {
 }
 
+// static
+bool VideoCapture_Dev::IsAvailable() {
+  return has_interface<PPB_VideoCapture_Dev>();
+}
+
 int32_t VideoCapture_Dev::StartCapture(
     const PP_VideoCaptureDeviceInfo_Dev& requested_info,
     uint32_t buffer_count) {

ppapi/cpp/dev/video_capture_dev.h

@@ -18,6 +18,9 @@ class VideoCapture_Dev : public Resource {
   VideoCapture_Dev(PP_Resource resource);
   VideoCapture_Dev(const VideoCapture_Dev& other);
 
+  // Returns true if the required interface is available.
+  static bool IsAvailable();
+
   int32_t StartCapture(const PP_VideoCaptureDeviceInfo_Dev& requested_info,
                        uint32_t buffer_count);
   int32_t ReuseBuffer(uint32_t buffer);