cc: Add color space to image decode caches

cc/paint/discardable_image_map_unittest.cc

Index: cc/paint/discardable_image_map_unittest.cc
diff --git a/cc/paint/discardable_image_map_unittest.cc b/cc/paint/discardable_image_map_unittest.cc
index fd7a63c3949eadbc404bb9633b0253fb75a2f14a..a8bb3eee39f2c607671e540369875e6179baeaa6 100644
--- a/cc/paint/discardable_image_map_unittest.cc
+++ b/cc/paint/discardable_image_map_unittest.cc
@@ -43,7 +43,9 @@ class DiscardableImageMapTest : public testing::Test {
       const DiscardableImageMap& image_map,
       const gfx::Rect& rect) {
     std::vector<DrawImage> draw_images;
-    image_map.GetDiscardableImagesInRect(rect, 1.f, &draw_images);
+    gfx::ColorSpace target_color_space = gfx::ColorSpace::CreateXYZD50();

[vmpstr, 2017/04/04 01:16:43]

Ah yes, the elusive XYZD50 color space. We meet again.

[ccameron, 2017/04/04 06:41:10]

Added a comment about the choice ... it's a "not nothing and not sRGB value...".

+    image_map.GetDiscardableImagesInRect(rect, 1.f, target_color_space,
+                                         &draw_images);
 
     std::vector<size_t> indices;
     image_map.images_rtree_.Search(rect, &indices);
@@ -56,8 +58,10 @@ class DiscardableImageMapTest : public testing::Test {
     }
 
     EXPECT_EQ(draw_images.size(), position_draw_images.size());
-    for (size_t i = 0; i < draw_images.size(); ++i)
+    for (size_t i = 0; i < draw_images.size(); ++i) {
       EXPECT_TRUE(draw_images[i].image() == position_draw_images[i].image);
+      EXPECT_EQ(draw_images[i].target_color_space(), target_color_space);
+    }
     return position_draw_images;
   }