Change platform app api getDisplayPath to take FileEntry.

chrome/test/data/extensions/platform_apps/get_display_path/test.js

Index: chrome/test/data/extensions/platform_apps/get_display_path/test.js
diff --git a/chrome/test/data/extensions/platform_apps/get_display_path/test.js b/chrome/test/data/extensions/platform_apps/get_display_path/test.js
index 2ab01eabc2b1639c2285edd72255de8a3bc1703b..e43fe9b01413805cc54b5553bda6c3456d897dbb 100644
--- a/chrome/test/data/extensions/platform_apps/get_display_path/test.js
+++ b/chrome/test/data/extensions/platform_apps/get_display_path/test.js
@@ -6,7 +6,7 @@
 // FileEntry in launchData.intent.data can be read.
 function onLaunched(launchData) {
   chrome.test.runTests([
-    function testIntent() {
+    function testGetDisplayPath() {
       chrome.test.assertFalse(!launchData, "No launchData");
       chrome.test.assertFalse(!launchData.intent, "No launchData.intent");
       chrome.test.assertEq(launchData.intent.action,
@@ -16,8 +16,8 @@ function onLaunched(launchData) {
       chrome.test.assertFalse(!launchData.intent.data,
           "No launchData.intent.data");
       var entry = launchData.intent.data;
-      chrome.fileSystem.getDisplayPath(entry.filesystem.name,
-          entry.fullPath.slice(1), chrome.test.callbackPass(function(path) {
+      chrome.fileSystem.getDisplayPath(entry,
+          chrome.test.callbackPass(function(path) {
         chrome.test.assertFalse(path.indexOf('test.txt') == -1);
       }));
     }