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 faba3dbe0392d2eb1392e62f8550d7d0e0022572..69d04e29566014235b8e064ed02cd236c00da613 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -50,6 +50,7 @@ Layer::Layer()
       fills_bounds_opaquely_(true),
       layer_updated_externally_(false),
       opacity_(1.0f),
+      invert_(false),
       delegate_(NULL) {
   CreateWebLayer();
 }
@@ -195,6 +196,19 @@ void Layer::SetBackgroundBlur(int blur_radius)
   background_blur_radius_ = blur_radius;
 }
 
+void Layer::SetInvert(bool invert)
+{
+  WebKit::WebFilterOperations filters;
+  if (invert) {
+    filters.append(WebKit::WebBasicComponentTransferFilterOperation(
+        WebKit::WebBasicComponentTransferFilterOperation::
+            BasicComponentTransferFilterTypeInvert, 1.0));
+  }
+  web_layer_.setFilters(filters);
+
+  invert_ = invert;
+}
+
 float Layer::GetTargetOpacity() const {
   if (animator_.get() && animator_->IsAnimatingProperty(
       LayerAnimationElement::OPACITY))