Implement High Contrast mode for Chrome OS

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index ae2085fe7b641e10f509d2f52c43980d5cf2d38a..050cc8f780f859214baeba9864a13e1b1e3817ee 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -52,6 +52,7 @@ Layer::Layer()
       fills_bounds_opaquely_(true),
       layer_updated_externally_(false),
       opacity_(1.0f),
+      inverted_(false),
       delegate_(NULL),
       scale_canvas_(true),
       device_scale_factor_(1.0f) {
@@ -66,6 +67,7 @@ Layer::Layer(LayerType type)
       fills_bounds_opaquely_(true),
       layer_updated_externally_(false),
       opacity_(1.0f),
+      inverted_(false),
       delegate_(NULL),
       scale_canvas_(true),
       device_scale_factor_(1.0f) {
@@ -195,8 +197,7 @@ void Layer::SetOpacity(float opacity) {
   GetAnimator()->SetOpacity(opacity);
 }
 
-void Layer::SetBackgroundBlur(int blur_radius)
-{
+void Layer::SetBackgroundBlur(int blur_radius) {
   WebKit::WebFilterOperations filters;
   if (blur_radius)
     filters.append(WebKit::WebBlurFilterOperation(blur_radius));
@@ -205,6 +206,18 @@ void Layer::SetBackgroundBlur(int blur_radius)
   background_blur_radius_ = blur_radius;
 }
 
+void Layer::SetInverted(bool inverted) {
+  WebKit::WebFilterOperations filters;
+  if (inverted) {
+    filters.append(WebKit::WebBasicComponentTransferFilterOperation(
+        WebKit::WebBasicComponentTransferFilterOperation::
+            BasicComponentTransferFilterTypeInvert, 1.0));
+  }
+  web_layer_.setFilters(filters);
+
+  inverted_ = inverted;
+}
+
 float Layer::GetTargetOpacity() const {
   if (animator_.get() && animator_->IsAnimatingProperty(
       LayerAnimationElement::OPACITY))