cc: Make raster source members const

cc/resources/display_list_recording_source.cc

Index: cc/resources/display_list_recording_source.cc
diff --git a/cc/resources/display_list_recording_source.cc b/cc/resources/display_list_recording_source.cc
index 9c63217939ca7bc5bfbc2b43d65fe0f3715ead42..01a3bcef9944e2504829e79ad3b40bef46bd5ec7 100644
--- a/cc/resources/display_list_recording_source.cc
+++ b/cc/resources/display_list_recording_source.cc
@@ -29,8 +29,10 @@ namespace cc {
 DisplayListRecordingSource::DisplayListRecordingSource()
     : slow_down_raster_scale_factor_for_debug_(0),
       can_use_lcd_text_(true),
+      requires_clear_(false),
       is_solid_color_(false),
       solid_color_(SK_ColorTRANSPARENT),
+      background_color_(SK_ColorTRANSPARENT),
       pixel_record_distance_(kPixelDistanceToRecord),
       is_suitable_for_gpu_rasterization_(true) {
 }
@@ -134,6 +136,14 @@ void DisplayListRecordingSource::SetSlowdownRasterScaleFactor(int factor) {
   slow_down_raster_scale_factor_for_debug_ = factor;
 }
 
+void DisplayListRecordingSource::SetBackgroundColor(SkColor background_color) {
+  background_color_ = background_color;
+}
+
+void DisplayListRecordingSource::SetRequiresClear(bool requires_clear) {
+  requires_clear_ = requires_clear;
+}
+
 void DisplayListRecordingSource::SetUnsuitableForGpuRasterizationForTesting() {
   is_suitable_for_gpu_rasterization_ = false;
 }