[scheduler] Use Finch to control background throttling.

third_party/WebKit/public/platform/WebScheduler.h

Index: third_party/WebKit/public/platform/WebScheduler.h
diff --git a/third_party/WebKit/public/platform/WebScheduler.h b/third_party/WebKit/public/platform/WebScheduler.h
index 71365c4a51bb04e1930d37c535146f93d9e194cb..e88caaf52d7e562cb51e8952318b3d75d0e69574 100644
--- a/third_party/WebKit/public/platform/WebScheduler.h
+++ b/third_party/WebKit/public/platform/WebScheduler.h
@@ -14,9 +14,7 @@
 #include <memory>
 
 namespace blink {
-
 class WebTaskRunner;
-class WebView;
 
 // This class is used to submit tasks and pass other information from Blink to
 // the platform's scheduler.
@@ -32,6 +30,18 @@ class BLINK_PLATFORM_EXPORT WebScheduler {
     virtual void ReportIntervention(const WebString& message) = 0;
   };
 
+  // Helper interface to plumb various settings from WebSettings to scheduler.
+  class BLINK_PLATFORM_EXPORT WebSchedulerSettings {

[Sami, 2016/11/04 16:50:28]

Instead of adding this generic interface, how would you feel about just adding a
configureBackgroundThrottling() method that takes all four parameters? The
reason I think I'd prefer that is that I don't want to introduce a new dumping
ground for settings but rather something more narrowly focused that we can blow
away once we're done with the Finch trials. WDYT?

[altimin, 2016/11/07 15:19:49]

Per offline discussion, renamed to WebViewSchedulerSettings and moved to
WebViewScheduler.

+   public:
+    virtual ~WebSchedulerSettings() {}
+
+    // Background throttling aggressiveness settings.
+    virtual float expensiveBackgroundThrottlingCPUBudget() = 0;
+    virtual float expensiveBackgroundThrottlingInitialBudget() = 0;
+    virtual float expensiveBackgroundThrottlingMaxBudget() = 0;
+    virtual float expensiveBackgroundThrottlingMaxDelay() = 0;
+  };
+
   virtual ~WebScheduler() {}
 
   // Called to prevent any more pending tasks from running. Must be called on
@@ -76,7 +86,8 @@ class BLINK_PLATFORM_EXPORT WebScheduler {
   // Creates a new WebViewScheduler for a given WebView. Must be called from
   // the associated WebThread.
   virtual std::unique_ptr<WebViewScheduler> createWebViewScheduler(
-      InterventionReporter*) = 0;
+      InterventionReporter*,
+      WebSchedulerSettings*) = 0;
 
   // Suspends the timer queue and increments the timer queue suspension count.
   // May only be called from the main thread.