Basic pixel tests for cc

cc/layer_tree_host_perftest.cc

Index: cc/layer_tree_host_perftest.cc
diff --git a/cc/layer_tree_host_perftest.cc b/cc/layer_tree_host_perftest.cc
index d72c1bd4de9aa8e0de2c8572d541f222c5ae9b8d..fde2f93a461a2c37cf2fcfa1abd34dcd635caf3f 100644
--- a/cc/layer_tree_host_perftest.cc
+++ b/cc/layer_tree_host_perftest.cc
@@ -10,6 +10,7 @@
 #include "base/json/json_reader.h"
 #include "base/path_service.h"
 #include "base/string_piece.h"
+#include "cc/cc_paths.h"
 #include "cc/content_layer.h"
 #include "cc/nine_patch_layer.h"
 #include "cc/solid_color_layer.h"
@@ -240,12 +241,11 @@ class LayerTreeHostPerfTestJsonReader : public LayerTreeHostPerfTest {
 
   void readTestFile(std::string name) {
     test_name_ = name;
-    FilePath filepath;
-    ASSERT_TRUE(PathService::Get(base::DIR_SOURCE_ROOT, &filepath));
-    filepath = filepath.AppendASCII("cc").AppendASCII("test")
-                       .AppendASCII("data").AppendASCII(name + ".json");
+    FilePath test_data_dir;
+    ASSERT_TRUE(PathService::Get(cc::DIR_TEST_DATA, &test_data_dir));
+    FilePath json_file = test_data_dir.AppendASCII(name + ".json");
     std::string json;
-    ASSERT_TRUE(file_util::ReadFileToString(filepath, &json));
+    ASSERT_TRUE(file_util::ReadFileToString(json_file, &json));
     tree_.reset(base::JSONReader::Read(json));
     ASSERT_TRUE(tree_);
   }