Fix examples for File System Provider API.

TEST=Manually tested both.
BUG=481670

Review URL: https://codereview.chromium.org/1138503005

Cr-Commit-Position: refs/heads/master@{#330461}

chrome/common/extensions/docs/examples/api/fileSystemProvider/archive/background.js

@@ -41,12 +41,13 @@ function onUnmountRequested(options, onSuccess, onError) {
   chrome.fileSystemProvider.unmount(
       {fileSystemId: options.fileSystemId},
       function() {
+        if (chrome.runtime.lastError) {
+          onError(chrome.runtime.lastError.message);
+          return;
+        }
         delete volumes[options.fileSystemId];
         saveState(); // Remove volume from local storage state.
         onSuccess();
-      },
-      function() {
-        onError('FAILED');
       });
 };
 
@@ -202,8 +203,14 @@ chrome.app.runtime.onLaunched.addListener(function(event) {
             volumes[displayPath] = new Volume(item.entry, metadata);
             chrome.fileSystemProvider.mount(
                 {fileSystemId: displayPath, displayName: item.entry.name},
-                function() { saveState(); },
-                function() { console.error('Failed to mount.'); });
+                function() {
+                  if (chrome.runtime.lastError) {
+                    console.error('Failed to mount because of: ' +
+                        chrome.runtime.lastError.message);
+                    return;
+                  };
+                  saveState();
+                });
           });
         },
         function(error) {

chrome/common/extensions/docs/examples/api/fileSystemProvider/archive/example1.fake

 {
   "/": {
     "isDirectory": true,
-    "name": "/",
+    "name": "",
     "size": 0,
     "modificationTime": "2014-06-26T08:47:11.591Z"
   },

chrome/common/extensions/docs/examples/api/fileSystemProvider/archive/example2.fake

 {
   "/": {
     "isDirectory": true,
-    "name": "/",
+    "name": "",
     "size": 0,
     "modificationTime": "2014-06-26T08:47:11.591Z"
   },

chrome/common/extensions/docs/examples/api/fileSystemProvider/archive/manifest.json

@@ -15,6 +15,10 @@
       "title": "Open fake archive"
     }
   },
+  "file_system_provider_capabilities": {
+    "multiple_mounts": true,
+    "source": "file"
+  },
   "app": {
     "background": {
       "scripts": [

chrome/common/extensions/docs/examples/api/fileSystemProvider/basic/background.js

@@ -10,7 +10,7 @@ var SHORT_CONTENTS = 'Just another example.';
 var LONGER_CONTENTS = 'It works!\nEverything gets displayed correctly.';
 
 var METADATA = {
-  '/': {isDirectory: true, name: '/', size: 0,
+  '/': {isDirectory: true, name: '', size: 0,
       modificationTime: MODIFICATION_DATE},
   '/file1.txt': {isDirectory: false, name: 'file1.txt',
       size: LONGER_CONTENTS.length, modificationTime: MODIFICATION_DATE,
@@ -99,21 +99,41 @@ function onReadFileRequested(options, onSuccess, onError) {
   onSuccess(buffer, false /* Last call. */);
 }
 
-// Mount the file system.
-chrome.runtime.onInstalled.addListener(function(details) {
+function onMountRequested(onSuccess, onError) {
   chrome.fileSystemProvider.mount(
       {fileSystemId: 'sample-file-system', displayName: 'Sample File System'},
-      function() {},
-      function() { console.error('Failed to mount.'); });
-});
+      function() {
+        if (chrome.runtime.lastError) {
+          onError(chrome.runtime.lastError.message);
+          console.error('Failed to mount because of: ' +
+              chrome.runtime.lastError.message);
+          return;
+        }
+        onSuccess();
+      });
+}
+
+function onUnmountRequested(options, onSuccess, onError) {
+  chrome.fileSystemProvider.unmount(
+      {fileSystemId: options.fileSystemId},
+      function() {
+        if (chrome.runtime.lastError) {
+          onError(chrome.runtime.lastError.message);
+          console.error('Failed to unmount because of: ' +
+              chrome.runtime.lastError.message);
+          return;
+        }
+        onSuccess();
+      });
+}
 
 chrome.fileSystemProvider.onGetMetadataRequested.addListener(
     onGetMetadataRequested);
 chrome.fileSystemProvider.onReadDirectoryRequested.addListener(
     onReadDirectoryRequested);
-chrome.fileSystemProvider.onOpenFileRequested.addListener(
-    onOpenFileRequested);
+chrome.fileSystemProvider.onOpenFileRequested.addListener(onOpenFileRequested);
 chrome.fileSystemProvider.onCloseFileRequested.addListener(
     onCloseFileRequested);
-chrome.fileSystemProvider.onReadFileRequested.addListener(
-    onReadFileRequested);
+chrome.fileSystemProvider.onReadFileRequested.addListener(onReadFileRequested);
+chrome.fileSystemProvider.onMountRequested.addListener(onMountRequested);
+chrome.fileSystemProvider.onUnmountRequested.addListener(onUnmountRequested);

chrome/common/extensions/docs/examples/api/fileSystemProvider/basic/manifest.json

@@ -7,6 +7,9 @@
   "permissions": [
     "fileSystemProvider"
   ],
+  "file_system_provider_capabilities": {
+    "source": "network"
+  },
   "background": {
     "scripts": [
       "background.js"