Support chrome app frame colors on ChromeOS.

ash/frame/custom_frame_view_ash.cc

Index: ash/frame/custom_frame_view_ash.cc
diff --git a/ash/frame/custom_frame_view_ash.cc b/ash/frame/custom_frame_view_ash.cc
index e4211e6d50f49adae759156acb3db423a655420e..8f0781db4c4d129d647740eba75689e4717900b2 100644
--- a/ash/frame/custom_frame_view_ash.cc
+++ b/ash/frame/custom_frame_view_ash.cc
@@ -153,6 +153,8 @@ class CustomFrameViewAsh::HeaderView
 
   void SizeConstraintsChanged();
 
+  void SetFrameColors(SkColor active_frame_color, SkColor inactive_frame_color);
+
   // views::View:
   virtual void Layout() override;
   virtual void OnPaint(gfx::Canvas* canvas) override;
@@ -271,6 +273,11 @@ void CustomFrameViewAsh::HeaderView::SizeConstraintsChanged() {
   Layout();
 }
 
+void CustomFrameViewAsh::HeaderView::SetFrameColors(
+    SkColor active_frame_color, SkColor inactive_frame_color) {
+  header_painter_->SetFrameColors(active_frame_color, inactive_frame_color);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh::HeaderView, views::View overrides:
 
@@ -453,6 +460,11 @@ void CustomFrameViewAsh::InitImmersiveFullscreenControllerForView(
   immersive_fullscreen_controller->Init(header_view_, frame_, header_view_);
 }
 
+void CustomFrameViewAsh::SetFrameColors(SkColor active_frame_color,
+                                        SkColor inactive_frame_color) {
+  header_view_->SetFrameColors(active_frame_color, inactive_frame_color);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh, views::NonClientFrameView overrides: