Initial skeleton of high-contrast mode.

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index cd578f3903f9ac16aa8302409e85ce03aed6351b..f3e44321aee8adaeda80a8e733aa22f810215c96 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -159,6 +159,24 @@ constexpr int kLetterPortraitPageHeight = 792;
 
 namespace blink {
 
+namespace {
+
+HighContrastSettings InitHighContrastSettingsFromSettings(Settings* settings) {
+  HighContrastSettings result;
+  if (settings) {
+    result.mode = settings->GetHighContrastMode();
+    result.grayscale = settings->GetHighContrastGrayscale();
+    result.contrast = settings->GetHighContrastContrast();
+  } else {
+    result.mode = HighContrastMode::kOff;
+    result.grayscale = false;
+    result.contrast = 0.0;
+  }
+  return result;
+}
+
+}  // namespace
+
 using namespace HTMLNames;
 
 // The maximum number of updatePlugins iterations that should be done before
@@ -3266,6 +3284,9 @@ void FrameView::PaintTree() {
   if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     if (GetLayoutView()->Layer()->NeedsRepaint()) {
       GraphicsContext graphics_context(*paint_controller_);
+      HighContrastSettings high_contrast_settings =
+          InitHighContrastSettingsFromSettings(frame_->GetSettings());
+      graphics_context.SetHighContrast(high_contrast_settings);
       if (RuntimeEnabledFeatures::printBrowserEnabled())
         graphics_context.SetPrinting(true);
       Paint(graphics_context, CullRect(LayoutRect::InfiniteIntRect()));
@@ -3311,7 +3332,9 @@ void FrameView::PaintTree() {
 void FrameView::PaintGraphicsLayerRecursively(GraphicsLayer* graphics_layer) {
   DCHECK(!RuntimeEnabledFeatures::slimmingPaintV2Enabled());
   if (graphics_layer->DrawsContent()) {
-    graphics_layer->Paint(nullptr);
+    HighContrastSettings high_contrast_settings =
+        InitHighContrastSettingsFromSettings(frame_->GetSettings());
+    graphics_layer->Paint(nullptr, &high_contrast_settings);
     NotifyPaint(graphics_layer->GetPaintController());
   }