Don't restart the ImageQualityController timer unless it is already half over.

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 4ae6c3cba36823239e2581a97f90dd37aa3064fd..9822f33e4a6c7f54fc811444d07d14eb307abf19 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -444,6 +444,7 @@ WebViewImpl::WebViewImpl(WebViewClient* client)
     , m_displayMode(WebDisplayModeBrowser)
     , m_elasticOverscroll(FloatSize())
     , m_scheduler(adoptPtr(Platform::current()->currentThread()->scheduler()->createWebViewScheduler(this).release()))
+    , m_lastFrameTimeMonotonic(0)
 {
     Page::PageClients pageClients;
     pageClients.chromeClient = m_chromeClientImpl.get();
@@ -1959,6 +1960,8 @@ void WebViewImpl::beginFrame(double lastFrameTimeMonotonic)
     if (!mainFrameImpl())
         return;
 
+    m_lastFrameTimeMonotonic = lastFrameTimeMonotonic;
+
     DocumentLifecycle::AllowThrottlingScope throttlingScope(mainFrameImpl()->frame()->document()->lifecycle());
     PageWidgetDelegate::animate(*m_page, lastFrameTimeMonotonic);
 }