Fix cc scrollbar layer issues with initialization, and use element ids throughout.

third_party/WebKit/Source/platform/graphics/CompositorElementIdTest.cpp

Index: third_party/WebKit/Source/platform/graphics/CompositorElementIdTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorElementIdTest.cpp b/third_party/WebKit/Source/platform/graphics/CompositorElementIdTest.cpp
index e0e812bedc6bfa5f14ff6cd86de4c01842bb9fac..19dc25adde6c3bbb8b3f98c66bd4e016ff020f32 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositorElementIdTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/CompositorElementIdTest.cpp
@@ -12,21 +12,22 @@ class CompositorElementIdTest : public ::testing::Test {};
 
 TEST_F(CompositorElementIdTest, EncodeDecode) {
   CompositorElementId element_id =
-      CreateCompositorElementId(1, CompositorSubElementId::kPrimary);
-  EXPECT_EQ(1u, DomNodeIdFromCompositorElementId(element_id));
-  EXPECT_EQ(CompositorSubElementId::kPrimary,
-            SubElementIdFromCompositorElementId(element_id));
+      CreateCompositorElementId(1, CompositorElementIdNamespace::kPrimary);
+  EXPECT_EQ(1u, IdFromCompositorElementId(element_id));
+  EXPECT_EQ(CompositorElementIdNamespace::kPrimary,
+            NamespaceFromCompositorElementId(element_id));
+
+  element_id = CreateCompositorElementId(
+      1, CompositorElementIdNamespace::kLinkHighlight);
+  EXPECT_EQ(1u, IdFromCompositorElementId(element_id));
+  EXPECT_EQ(CompositorElementIdNamespace::kLinkHighlight,
+            NamespaceFromCompositorElementId(element_id));
 
   element_id =
-      CreateCompositorElementId(1, CompositorSubElementId::kLinkHighlight);
-  EXPECT_EQ(1u, DomNodeIdFromCompositorElementId(element_id));
-  EXPECT_EQ(CompositorSubElementId::kLinkHighlight,
-            SubElementIdFromCompositorElementId(element_id));
-
-  element_id = CreateCompositorElementId(23, CompositorSubElementId::kScroll);
-  EXPECT_EQ(23u, DomNodeIdFromCompositorElementId(element_id));
-  EXPECT_EQ(CompositorSubElementId::kScroll,
-            SubElementIdFromCompositorElementId(element_id));
+      CreateCompositorElementId(23, CompositorElementIdNamespace::kScroll);
+  EXPECT_EQ(23u, IdFromCompositorElementId(element_id));
+  EXPECT_EQ(CompositorElementIdNamespace::kScroll,
+            NamespaceFromCompositorElementId(element_id));
 }
 
 }  // namespace blink