Plumb PaintImage for the img.decode instead of SkImage.

cc/tiles/decoded_image_tracker_unittest.cc

Index: cc/tiles/decoded_image_tracker_unittest.cc
diff --git a/cc/tiles/decoded_image_tracker_unittest.cc b/cc/tiles/decoded_image_tracker_unittest.cc
index 6b8b25ab02fb9c217d18303fe3f18aa3fa293944..a1c9ade851395a1948343010908d07e7888df075 100644
--- a/cc/tiles/decoded_image_tracker_unittest.cc
+++ b/cc/tiles/decoded_image_tracker_unittest.cc
@@ -56,8 +56,9 @@ class DecodedImageTrackerTest : public testing::Test {
 TEST_F(DecodedImageTrackerTest, QueueImageLocksImages) {
   bool locked = false;
   decoded_image_tracker()->QueueImageDecode(
-      nullptr, base::Bind([](bool* locked, bool success) { *locked = true; },
-                          base::Unretained(&locked)));
+      PaintImage(),
+      base::Bind([](bool* locked, bool success) { *locked = true; },
+                 base::Unretained(&locked)));
   EXPECT_TRUE(locked);
   EXPECT_EQ(1u, image_controller()->num_locked_images());
 }
@@ -65,8 +66,9 @@ TEST_F(DecodedImageTrackerTest, QueueImageLocksImages) {
 TEST_F(DecodedImageTrackerTest, NotifyFrameFinishedUnlocksImages) {
   bool locked = false;
   decoded_image_tracker()->QueueImageDecode(
-      nullptr, base::Bind([](bool* locked, bool success) { *locked = true; },
-                          base::Unretained(&locked)));
+      PaintImage(),
+      base::Bind([](bool* locked, bool success) { *locked = true; },
+                 base::Unretained(&locked)));
   EXPECT_TRUE(locked);
   EXPECT_EQ(1u, image_controller()->num_locked_images());
 
@@ -75,8 +77,9 @@ TEST_F(DecodedImageTrackerTest, NotifyFrameFinishedUnlocksImages) {
 
   locked = false;
   decoded_image_tracker()->QueueImageDecode(
-      nullptr, base::Bind([](bool* locked, bool success) { *locked = true; },
-                          base::Unretained(&locked)));
+      PaintImage(),
+      base::Bind([](bool* locked, bool success) { *locked = true; },
+                 base::Unretained(&locked)));
   EXPECT_TRUE(locked);
   EXPECT_EQ(2u, image_controller()->num_locked_images());