ImageCapture: Implement takePhoto() for Mac AVFoundation

media/base/mac/avfoundation_glue.h

Index: media/base/mac/avfoundation_glue.h
diff --git a/media/base/mac/avfoundation_glue.h b/media/base/mac/avfoundation_glue.h
index a5b430412fdcfe3da37983f4d41fcdf19bbb0451..1aa981c2029c03b5e8bc150740278d3b2c0dffcb 100644
--- a/media/base/mac/avfoundation_glue.h
+++ b/media/base/mac/avfoundation_glue.h
@@ -51,6 +51,7 @@ class MEDIA_EXPORT AVFoundationGlue {
 
   static Class AVCaptureSessionClass();
   static Class AVCaptureVideoDataOutputClass();
+  static Class AVCaptureStillImageOutputClass();
 #endif  // defined(__OBJC__)
 
  private:
@@ -95,6 +96,9 @@ MEDIA_EXPORT
 
 MEDIA_EXPORT
 @interface CrAVCaptureOutput : NSObject  // Originally from AVCaptureOutput.h.
+
+- (NSArray*)connections;
+
 @end
 
 // Originally AVCaptureSession and coming from AVCaptureSession.h.
@@ -104,6 +108,7 @@ MEDIA_EXPORT
 - (void)release;
 - (void)addInput:(CrAVCaptureInput*)input;
 - (void)removeInput:(CrAVCaptureInput*)input;
+- (NSArray*)outputs;
 - (void)addOutput:(CrAVCaptureOutput*)output;
 - (void)removeOutput:(CrAVCaptureOutput*)output;
 - (BOOL)isRunning;
@@ -156,6 +161,17 @@ MEDIA_EXPORT
 
 @end
 
+// Originally AVCaptureStillImageOutput and coming from AVCaptureOutput.h.
+MEDIA_EXPORT
+@interface CrAVCaptureStillImageOutput : CrAVCaptureOutput
+
+typedef void (^CompletionHandler)(CoreMediaGlue::CMSampleBufferRef, NSError*);
+- (void)
+captureStillImageAsynchronouslyFromConnection:(CrAVCaptureConnection*)connection
+                            completionHandler:(CompletionHandler)handler;
+
+@end
+
 // Class to provide access to class methods of AVCaptureDevice.
 MEDIA_EXPORT
 @interface AVCaptureDeviceGlue : NSObject