Screen Video Capture: Implement suspend optimization.

media/capture/content/android/screen_capture_machine_android.cc

Index: media/capture/content/android/screen_capture_machine_android.cc
diff --git a/media/capture/content/android/screen_capture_machine_android.cc b/media/capture/content/android/screen_capture_machine_android.cc
index f3b2ee90970949b4efd9156143c4c424757d8f7d..69c8906c4f1c94b1c48aa5de1bcedcbaa22e72b9 100644
--- a/media/capture/content/android/screen_capture_machine_android.cc
+++ b/media/capture/content/android/screen_capture_machine_android.cc
@@ -21,7 +21,8 @@ bool ScreenCaptureMachineAndroid::RegisterScreenCaptureMachine(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-ScreenCaptureMachineAndroid::ScreenCaptureMachineAndroid() {}
+ScreenCaptureMachineAndroid::ScreenCaptureMachineAndroid()
+    : suspend_frame_capture_(false) {}
 
 ScreenCaptureMachineAndroid::~ScreenCaptureMachineAndroid() {}
 
@@ -43,6 +44,9 @@ void ScreenCaptureMachineAndroid::OnRGBAFrameAvailable(JNIEnv* env,
                                                        jint width,
                                                        jint height,
                                                        jlong timestamp) {
+  if (suspend_frame_capture_)
+    return;
+
   const VideoCaptureOracle::Event event = VideoCaptureOracle::kCompositorUpdate;
   const uint64_t absolute_micro =
       timestamp / base::Time::kNanosecondsPerMicrosecond;
@@ -118,6 +122,9 @@ void ScreenCaptureMachineAndroid::OnI420FrameAvailable(JNIEnv* env,
                                                        jint width,
                                                        jint height,
                                                        jlong timestamp) {
+  if (suspend_frame_capture_)
+    return;
+
   const VideoCaptureOracle::Event event = VideoCaptureOracle::kCompositorUpdate;
   const uint64_t absolute_micro =
       timestamp / base::Time::kNanosecondsPerMicrosecond;