[scheduler] Use Finch to control background throttling.

third_party/WebKit/public/platform/WebViewScheduler.h

Index: third_party/WebKit/public/platform/WebViewScheduler.h
diff --git a/third_party/WebKit/public/platform/WebViewScheduler.h b/third_party/WebKit/public/platform/WebViewScheduler.h
index ae94ab88081f36df642d90e7d11562c81d4b5d25..55f61844efb87adf1e1d4e371c783616923df865 100644
--- a/third_party/WebKit/public/platform/WebViewScheduler.h
+++ b/third_party/WebKit/public/platform/WebViewScheduler.h
@@ -16,6 +16,18 @@ class WebFrameScheduler;
 
 class BLINK_PLATFORM_EXPORT WebViewScheduler {
  public:
+  // Helper interface to plumb settings from WebSettings to scheduler.
+  class BLINK_PLATFORM_EXPORT WebViewSchedulerSettings {

[Sami, 2016/11/07 16:33:42]

nit: To improve readability how about just calling this |Settings|?

[altimin, 2016/11/07 17:01:33]

I considered doing this, but given that WebViewImpl inherits this interface, it
will interfere with Settings from WebKit (core/frame/Settings.h), which is ugly.

[Sami, 2016/11/07 17:08:34]

Hmm, it will inherit WebViewScheduler::Settings, not Settings, so there
shouldn't be any confusion?

[altimin, 2016/11/07 17:10:29]

My understanding is that Settings inside WebViewScheduler will start to refer to
WebViewScheduler::Settings, which will cause confusion. (I tried and experienced
that).

+   public:
+    virtual ~WebViewSchedulerSettings() {}
+
+    // Background throttling aggressiveness settings.
+    virtual float expensiveBackgroundThrottlingCPUBudget() = 0;
+    virtual float expensiveBackgroundThrottlingInitialBudget() = 0;
+    virtual float expensiveBackgroundThrottlingMaxBudget() = 0;
+    virtual float expensiveBackgroundThrottlingMaxDelay() = 0;
+  };
+
   virtual ~WebViewScheduler() {}
 
   // The scheduler may throttle tasks associated with background pages.