[scheduler] Use Finch to control background throttling.

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 2c685304358d95ccad52de936e3b62ffd660cd0a..57ad9a13f0afb96cb11c5a697bd9330db421b35d 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -435,7 +435,7 @@ WebViewImpl::WebViewImpl(WebViewClient* client,
       m_scheduler(wrapUnique(Platform::current()
                                  ->currentThread()
                                  ->scheduler()
-                                 ->createWebViewScheduler(this)
+                                 ->createWebViewScheduler(this, this)
                                  .release())),
       m_lastFrameTimeMonotonic(0),
       m_overrideCompositorVisibility(false) {
@@ -1098,6 +1098,22 @@ void WebViewImpl::ReportIntervention(const WebString& message) {
   mainFrame()->addMessageToConsole(consoleMessage);
 }
 
+float WebViewImpl::expensiveBackgroundThrottlingCPUBudget() {
+  return settingsImpl()->expensiveBackgroundThrottlingCPUBudget();
+}
+
+float WebViewImpl::expensiveBackgroundThrottlingInitialBudget() {
+  return settingsImpl()->expensiveBackgroundThrottlingInitialBudget();
+}
+
+float WebViewImpl::expensiveBackgroundThrottlingMaxBudget() {
+  return settingsImpl()->expensiveBackgroundThrottlingMaxBudget();
+}
+
+float WebViewImpl::expensiveBackgroundThrottlingMaxDelay() {
+  return settingsImpl()->expensiveBackgroundThrottlingMaxDelay();
+}
+
 WebInputEventResult WebViewImpl::handleKeyEvent(const WebKeyboardEvent& event) {
   DCHECK((event.type == WebInputEvent::RawKeyDown) ||
          (event.type == WebInputEvent::KeyDown) ||