[Media Controls] Add UMA for timeline scrubber

third_party/WebKit/Source/core/html/shadow/MediaControlElements.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 13 matching lines @@
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MediaControlElements_h
 #define MediaControlElements_h
 
 #include "core/html/shadow/MediaControlElementTypes.h"
+#include "core/html/shadow/MediaControlTimelineMetrics.h"
 #include "public/platform/WebLocalizedString.h"
 
 namespace blink {
 
 class TextTrack;
 
 // ----------------------------
 
 class MediaControlPanelElement final : public MediaControlDivElement {
  public:
@@ skipping 222 matching lines @@
  public:
   static MediaControlTimelineElement* create(MediaControls&);
 
   bool willRespondToMouseClickEvents() override;
 
   // FIXME: An "earliest possible position" will be needed once that concept
   // is supported by HTMLMediaElement, see https://crbug.com/137275
   void setPosition(double);
   void setDuration(double);
 
+  // Logs width to UMA. Should be called the first time the media is played.
+  void recordWidthOnFirstPlay();
+
  private:
   explicit MediaControlTimelineElement(MediaControls&);
 
   void defaultEventHandler(Event*) override;
   bool keepEventInNode(Event*) override;
+
+  // Width in CSS pixels * pageZoomFactor (ignores CSS transforms for
+  // simplicity; deliberately ignores pinch zoom's pageScaleFactor).
+  int timelineWidth();

[mlamouri (slow - plz ping), 2017/03/30 21:43:00]

getTimelineWidth() to be more Chromium friendly? :)

[johnme, 2017/03/31 13:47:23]

Blink style guide says not to:
https://sites.google.com/a/chromium.org/dev/blink/coding-style
[names-setter-getter]

+
+  MediaControlTimelineMetrics m_metrics;
 };
 
 // ----------------------------
 
 class MediaControlFullscreenButtonElement final
     : public MediaControlInputElement {
  public:
   static MediaControlFullscreenButtonElement* create(MediaControls&);
 
   bool willRespondToMouseClickEvents() override { return true; }
@@ skipping 88 matching lines @@
  public:
   static MediaControlCurrentTimeDisplayElement* create(MediaControls&);
 
  private:
   explicit MediaControlCurrentTimeDisplayElement(MediaControls&);
 };
 
 }  // namespace blink
 
 #endif  // MediaControlElements_h