Refactor all video related processing to its own class

tools/telemetry/telemetry/core/platform/__init__.py

Index: tools/telemetry/telemetry/core/platform/__init__.py
diff --git a/tools/telemetry/telemetry/core/platform/__init__.py b/tools/telemetry/telemetry/core/platform/__init__.py
index db7e7c299b287caa4832d70f3602e57949904754..70c423f7f773a3f40ee82ffa5b7519b4f3908fb6 100644
--- a/tools/telemetry/telemetry/core/platform/__init__.py
+++ b/tools/telemetry/telemetry/core/platform/__init__.py
@@ -165,14 +165,10 @@ class Platform(object):
   def StopVideoCapture(self):
     """Stops capturing video.
 
-    Yields:
-      (time_ms, bitmap) tuples representing each video keyframe. Only the first
-      frame in a run of sequential duplicate bitmaps is included.
-        time_ms is milliseconds relative to the first frame.
-        bitmap is a telemetry.core.Bitmap.
+    Returns:
+      A telemetry.core.video.Video object.
     """
-    for t in self._platform_backend.StopVideoCapture():
-      yield t
+    return self._platform_backend.StopVideoCapture()
 
   def CanMonitorPower(self):
     """Returns True iff power can be monitored asynchronously via