Update to Chromium revision a106f0ab (#464641)

- Remove CefWindowInfo.transparent_painting_enabled. Set
  CefBrowserSettings.background_color to an opaque or transparent
  value instead.

tests/cefclient/browser/osr_renderer.h

@@ -14,15 +14,10 @@ namespace client {
 class OsrRenderer {
  public:
   struct Settings {
-    Settings();
-
-    // If true use transparent rendering.
-    bool transparent;
-
     // If true draw a border around update rectangles.
     bool show_update_rect;
 
-    // Background color.
+    // Background color. Enables transparency if the alpha component is 0.
     cef_color_t background_color;
   };
 
@@ -53,9 +48,6 @@ class OsrRenderer {
   void SetSpin(float spinX, float spinY);
   void IncrementSpin(float spinDX, float spinDY);
 
-  bool IsTransparent() const { return settings_.transparent; }
-  cef_color_t GetBackgroundColor() const { return settings_.background_color; }
-
   int GetViewWidth() const { return view_width_; }
   int GetViewHeight() const { return view_height_; }
 
@@ -66,6 +58,10 @@ class OsrRenderer {
   void ClearPopupRects();
 
  private:
+  inline bool IsTransparent() const {
+    return CefColorGetA(settings_.background_color) == 0;
+  };
+
   const Settings settings_;
   bool initialized_;
   unsigned int texture_id_;