Mac: Fix background color (issue #1161)

patch/patch.cfg

@@ -209,4 +209,10 @@ patches = [
     'name': 'widevine_cdm_1631',
     'path': '../media/cdm/stub/',
   },
+  {
+    # Fix background color on Mac.
+    # https://codereview.chromium.org/1070383005 (reverted)
+    'name': 'render_widget_host_1070383005',
+    'path': '../content/browser/renderer_host/',
+  },
 ]

patch/patches/render_widget_host_1070383005.patch

@@ -0,0 +1,14 @@
+diff --git render_widget_host_view_mac.mm render_widget_host_view_mac.mm
+index 66f1c31..0eac488 100644
+--- render_widget_host_view_mac.mm
++++ render_widget_host_view_mac.mm
+@@ -582,9 +582,6 @@ RenderWidgetHostViewMac::RenderWidgetHostViewMac(RenderWidgetHost* widget,
+   // Paint this view host with |background_color_| when there is no content
+   // ready to draw.
+   background_layer_.reset([[CALayer alloc] init]);
+-  // Set the default color to be white. This is the wrong thing to do, but many
+-  // UI components expect this view to be opaque.
+-  [background_layer_ setBackgroundColor:CGColorGetConstantColor(kCGColorWhite)];
+   [cocoa_view_ setLayer:background_layer_];
+   [cocoa_view_ setWantsLayer:YES];
+