Add Settings::useDefaultImageInterpolationQuality and use it in repaint tests

third_party/WebKit/Source/core/layout/ImageQualityController.cpp

Index: third_party/WebKit/Source/core/layout/ImageQualityController.cpp
diff --git a/third_party/WebKit/Source/core/layout/ImageQualityController.cpp b/third_party/WebKit/Source/core/layout/ImageQualityController.cpp
index 1635d905fdd9a0deb90658a8823f9c395b64d04c..429c944a4d78b12385518496691ca5351f6ad2a6 100644
--- a/third_party/WebKit/Source/core/layout/ImageQualityController.cpp
+++ b/third_party/WebKit/Source/core/layout/ImageQualityController.cpp
@@ -32,6 +32,7 @@
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
 
@@ -166,6 +167,11 @@ bool ImageQualityController::shouldPaintAtLowQuality(const LayoutObject& object,
     if (object.style()->imageRendering() == ImageRenderingOptimizeContrast)
         return true;
 
+    if (LocalFrame* frame = object.frame()) {
+        if (frame->settings() && frame->settings()->useDefaultImageInterpolationQuality())
+            return false;
+    }
+
     // Look ourselves up in the hashtables.
     ObjectLayerSizeMap::iterator i = m_objectLayerSizeMap.find(&object);
     LayerSizeMap* innerMap = nullptr;