cc: Re-enable disabled tile manager unittests (plus fixes)

cc/test/fake_display_list_raster_source.cc

Index: cc/test/fake_display_list_raster_source.cc
diff --git a/cc/test/fake_display_list_raster_source.cc b/cc/test/fake_display_list_raster_source.cc
index de69afac581afa2bcae2e98459e0c07e602db497..403784d697d04ead747d37b3ef5c237e72b61092 100644
--- a/cc/test/fake_display_list_raster_source.cc
+++ b/cc/test/fake_display_list_raster_source.cc
@@ -133,6 +133,8 @@ FakeDisplayListRasterSource::FakeDisplayListRasterSource(
     const DisplayListRecordingSource* recording_source,
     bool can_use_lcd)
     : DisplayListRasterSource(recording_source, can_use_lcd),
+      is_solid_color_(false),
+      is_solid_color_overridden_(false),
       playback_allowed_event_(nullptr) {}
 
 FakeDisplayListRasterSource::FakeDisplayListRasterSource(
@@ -140,6 +142,8 @@ FakeDisplayListRasterSource::FakeDisplayListRasterSource(
     bool can_use_lcd,
     base::WaitableEvent* playback_allowed_event)
     : DisplayListRasterSource(recording_source, can_use_lcd),
+      is_solid_color_(false),
+      is_solid_color_overridden_(false),
       playback_allowed_event_(playback_allowed_event) {}
 
 FakeDisplayListRasterSource::~FakeDisplayListRasterSource() {}
@@ -155,4 +159,9 @@ void FakeDisplayListRasterSource::PlaybackToCanvas(
       canvas, canvas_bitmap_rect, canvas_playback_rect, contents_scale);
 }
 
+bool FakeDisplayListRasterSource::IsSolidColor() const {
+  return is_solid_color_overridden_ ? is_solid_color_
+                                    : DisplayListRasterSource::IsSolidColor();
+}
+
 }  // namespace cc