[Picture-in-Picture] Add UseCounter.

As part of the origin trial, we should record usage with UseCounter, as that
can be automatically monitored by the origin trials infrastructure.

Bug: 806249
Change-Id: I7978d33f57c9d31ecc2b18a410c66475f3971ddb
Reviewed-on: https://chromium-review.googlesource.com/1055396
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558324}

third_party/blink/public/platform/web_feature.mojom

@@ -1908,6 +1908,18 @@ enum WebFeature {
   kPaymentRequestInvalidCurrencyCode = 2435,
   kV8ArraySortNoElementsProtector = 2436,
   kV8ArrayPrototypeSortJSArrayModifiedPrototype = 2437,
+  kV8Document_PictureInPictureEnabled_AttributeGetter = 2438,
+  kV8Document_PictureInPictureElement_AttributeGetter = 2439,
+  kV8Document_ExitPictureInPicture_Method = 2440,
+  kV8ShadowRoot_PictureInPictureElement_AttributeGetter = 2441,
+  kV8HTMLVideoElement_DisablePictureInPicture_AttributeGetter = 2442,
+  kV8HTMLVideoElement_DisablePictureInPicture_AttributeSetter = 2443,
+  kV8HTMLVideoElement_RequestPictureInPicture_Method = 2444,
+  kEnterPictureInPictureEventListener = 2445,
+  kLeavePictureInPictureEventListener = 2446,
+  kV8PictureInPictureWindow_Height_AttributeGetter = 2447,
+  kV8PictureInPictureWindow_Width_AttributeGetter = 2448,
+  kPictureInPictureWindowResizeEventListener = 2449,
 
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.

third_party/blink/renderer/core/html/media/html_video_element.cc

@@ -36,6 +36,7 @@
 #include "third_party/blink/renderer/core/frame/local_dom_window.h"
 #include "third_party/blink/renderer/core/frame/picture_in_picture_controller.h"
 #include "third_party/blink/renderer/core/frame/settings.h"
+#include "third_party/blink/renderer/core/frame/use_counter.h"
 #include "third_party/blink/renderer/core/fullscreen/fullscreen.h"
 #include "third_party/blink/renderer/core/fullscreen/fullscreen_options.h"
 #include "third_party/blink/renderer/core/html/media/media_custom_controls_fullscreen_detector.h"
@@ -574,6 +575,20 @@ WebMediaPlayer::DisplayType HTMLVideoElement::DisplayType() const {
   return HTMLMediaElement::DisplayType();
 }
 
+void HTMLVideoElement::AddedEventListener(
+    const AtomicString& event_type,
+    RegisteredEventListener& registered_listener) {
+  if (event_type == EventTypeNames::enterpictureinpicture) {
+    UseCounter::Count(GetExecutionContext(),
+                      WebFeature::kEnterPictureInPictureEventListener);
+  } else if (event_type == EventTypeNames::leavepictureinpicture) {
+    UseCounter::Count(GetExecutionContext(),
+                      WebFeature::kLeavePictureInPictureEventListener);
+  }
+
+  HTMLMediaElement::AddedEventListener(event_type, registered_listener);
+}
+
 bool HTMLVideoElement::IsRemotingInterstitialVisible() const {
   return remoting_interstitial_ && remoting_interstitial_->IsVisible();
 }

third_party/blink/renderer/core/html/media/html_video_element.h

@@ -154,6 +154,11 @@ class CORE_EXPORT HTMLVideoElement final : public HTMLMediaElement,
   void MediaRemotingStopped(WebLocalizedString::Name error_msg) final;
   WebMediaPlayer::DisplayType DisplayType() const final;
 
+ protected:
+  // EventTarget overrides.
+  void AddedEventListener(const AtomicString& event_type,
+                          RegisteredEventListener&) override;
+
  private:
   friend class MediaCustomControlsFullscreenDetectorTest;
   friend class HTMLMediaElementEventListenersTest;

third_party/blink/renderer/modules/picture_in_picture/document_picture_in_picture.idl

@@ -9,10 +9,10 @@
     OriginTrialEnabled=PictureInPictureAPI
 ]
 partial interface Document {
-    readonly attribute boolean pictureInPictureEnabled;
+    [Measure] readonly attribute boolean pictureInPictureEnabled;
 
-    [CallWith=ScriptState] Promise<void> exitPictureInPicture();
+    [CallWith=ScriptState, Measure] Promise<void> exitPictureInPicture();
 
     // TODO(crbug.com/656517): Define this attribute in DocumentOrShadowRoot.
-    readonly attribute HTMLVideoElement? pictureInPictureElement;
+    [Measure] readonly attribute HTMLVideoElement? pictureInPictureElement;
 };
\ No newline at end of file

third_party/blink/renderer/modules/picture_in_picture/html_video_element_picture_in_picture.idl

@@ -8,11 +8,11 @@
     OriginTrialEnabled=PictureInPictureAPI
 ]
 partial interface HTMLVideoElement {
-    [CallWith=ScriptState] Promise<PictureInPictureWindow> requestPictureInPicture();
+    [CallWith=ScriptState, Measure] Promise<PictureInPictureWindow> requestPictureInPicture();
 
     attribute EventHandler onenterpictureinpicture;
     attribute EventHandler onleavepictureinpicture;
 
-    [CEReactions, Reflect] attribute boolean disablePictureInPicture;
+    [CEReactions, Measure, Reflect] attribute boolean disablePictureInPicture;
 
 };
\ No newline at end of file

third_party/blink/renderer/modules/picture_in_picture/picture_in_picture_window.cc

@@ -5,6 +5,7 @@
 #include "third_party/blink/renderer/modules/picture_in_picture/picture_in_picture_window.h"
 
 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
+#include "third_party/blink/renderer/core/frame/use_counter.h"
 
 namespace blink {
 
@@ -21,6 +22,18 @@ const AtomicString& PictureInPictureWindow::InterfaceName() const {
   return EventTargetNames::PictureInPictureWindow;
 }
 
+void PictureInPictureWindow::AddedEventListener(
+    const AtomicString& event_type,
+    RegisteredEventListener& registered_listener) {
+  if (event_type == EventTypeNames::resize) {
+    UseCounter::Count(GetExecutionContext(),
+                      WebFeature::kPictureInPictureWindowResizeEventListener);
+  }
+
+  EventTargetWithInlineData::AddedEventListener(event_type,
+                                                registered_listener);
+}
+
 void PictureInPictureWindow::Trace(blink::Visitor* visitor) {
   EventTargetWithInlineData::Trace(visitor);
   ContextClient::Trace(visitor);

third_party/blink/renderer/modules/picture_in_picture/picture_in_picture_window.h

@@ -39,6 +39,11 @@ class PictureInPictureWindow : public EventTargetWithInlineData,
 
   void Trace(blink::Visitor*) override;
 
+ protected:
+  // EventTarget overrides.
+  void AddedEventListener(const AtomicString& event_type,
+                          RegisteredEventListener&) override;
+
  private:
   // The Picture-in-Picture window size in pixels.
   WebSize size_;

third_party/blink/renderer/modules/picture_in_picture/picture_in_picture_window.idl

@@ -7,8 +7,8 @@
     OriginTrialEnabled=PictureInPictureAPI
 ]
 interface PictureInPictureWindow : EventTarget {
-  readonly attribute long width;
-  readonly attribute long height;
+  [Measure] readonly attribute long width;
+  [Measure] readonly attribute long height;
 
   attribute EventHandler onresize;
 };
\ No newline at end of file

third_party/blink/renderer/modules/picture_in_picture/shadow_root_picture_in_picture.idl

@@ -9,5 +9,5 @@
 ]
 partial interface ShadowRoot {
     // TODO(crbug.com/656517): Define this attribute in DocumentOrShadowRoot.
-    readonly attribute HTMLVideoElement? pictureInPictureElement;
+    [Measure] readonly attribute HTMLVideoElement? pictureInPictureElement;
 };
\ No newline at end of file

tools/metrics/histograms/enums.xml

@@ -18657,6 +18657,21 @@ Called by update_net_error_codes.py.-->
   <int value="2435" label="PaymentRequestInvalidCurrencyCode"/>
   <int value="2436" label="V8ArraySortNoElementsProtector"/>
   <int value="2437" label="V8ArrayPrototypeSortJSArrayModifiedPrototype"/>
+  <int value="2438" label="V8Document_PictureInPictureEnabled_AttributeGetter"/>
+  <int value="2439" label="V8Document_PictureInPictureElement_AttributeGetter"/>
+  <int value="2440" label="V8Document_ExitPictureInPicture_Method"/>
+  <int value="2441"
+      label="V8ShadowRoot_PictureInPictureElement_AttributeGetter"/>
+  <int value="2442"
+      label="V8HTMLVideoElement_DisablePictureInPicture_AttributeGetter"/>
+  <int value="2443"
+      label="V8HTMLVideoElement_DisablePictureInPicture_AttributeSetter"/>
+  <int value="2444" label="V8HTMLVideoElement_RequestPictureInPicture_Method"/>
+  <int value="2445" label="EnterPictureInPictureEventListener"/>
+  <int value="2446" label="LeavePictureInPictureEventListener"/>
+  <int value="2447" label="V8PictureInPictureWindow_Height_AttributeGetter"/>
+  <int value="2448" label="V8PictureInPictureWindow_Width_AttributeGetter"/>
+  <int value="2449" label="PictureInPictureWindowResizeEventListener"/>
 </enum>
 
 <enum name="FeedbackSource">