Adding blink side flag that allows disabling YUV decoding

Source/web/WebSettingsImpl.cpp

Index: Source/web/WebSettingsImpl.cpp
diff --git a/Source/web/WebSettingsImpl.cpp b/Source/web/WebSettingsImpl.cpp
index 7e2188f734376b4a23cb499aea0d051ccf987b55..7fada2c1e86660241600495a31137b73f20c3ad3 100644
--- a/Source/web/WebSettingsImpl.cpp
+++ b/Source/web/WebSettingsImpl.cpp
@@ -33,6 +33,7 @@
 
 #include "core/frame/Settings.h"
 #include "core/inspector/InspectorController.h"
+#include "platform/graphics/DecodingImageGenerator.h"
 #include "platform/graphics/DeferredImageDecoder.h"
 
 #include "public/platform/WebString.h"
@@ -55,6 +56,7 @@ WebSettingsImpl::WebSettingsImpl(Settings* settings, InspectorController* inspec
     , m_viewportMetaNonUserScalableQuirk(false)
     , m_clobberUserAgentInitialScaleQuirk(false)
     , m_mainFrameResizesAreOrientationChanges(false)
+    , m_yuvImageDecodingEnabled(false)
 {
     ASSERT(settings);
 }
@@ -507,6 +509,12 @@ void WebSettingsImpl::setDeferredImageDecodingEnabled(bool enabled)
     m_deferredImageDecodingEnabled = enabled;
 }
 
+void WebSettingsImpl::setYUVImageDecodingEnabled(bool enabled)
+{
+    DecodingImageGenerator::setYUVDecodingEnabled(enabled);
+    m_yuvImageDecodingEnabled = enabled;
+}
+
 void WebSettingsImpl::setDeferredFiltersEnabled(bool enabled)
 {
     m_settings->setDeferredFiltersEnabled(enabled);