[fsp] Introduce file_system_provider::Service class for the FileSystemProvider API.

chrome/test/data/extensions/api_test/file_system_provider/mount/test.js

Index: chrome/test/data/extensions/api_test/file_system_provider/mount/test.js
diff --git a/chrome/test/data/extensions/api_test/file_system_provider/mount/test.js b/chrome/test/data/extensions/api_test/file_system_provider/mount/test.js
index bb8fcef5db3861bc8b36fd2c7d02f1d08496b574..1912d390c2ea6b1a71a8147ab6596313ad907314 100644
--- a/chrome/test/data/extensions/api_test/file_system_provider/mount/test.js
+++ b/chrome/test/data/extensions/api_test/file_system_provider/mount/test.js
@@ -16,6 +16,7 @@ chrome.test.runTests([
       }
     );
   },
+
   function emptyDisplayName() {
     chrome.fileSystemProvider.mount(
       '',
@@ -28,4 +29,52 @@ chrome.test.runTests([
       }
     );
   },
+
+  function successfulMount() {
+    chrome.fileSystemProvider.mount(
+      'caramel-candy.zip',
+      function(fileSystemId) {
+        chrome.test.assertTrue(fileSystemId != '');
+        chrome.fileBrowserPrivate.getVolumeMetadataList(function(volumeList) {
+          var found = volumeList.filter(function(volumeInfo) {
+            return volumeInfo.volumeId == 'provided:' + fileSystemId;
+          });
+          chrome.test.assertEq(1, found.length);
+          chrome.test.succeed();
+        });
+      },
+      function(error) {
+        chrome.test.fail();
+      });
+  },
+
+  function stressMountTest() {
+    // Try to create more than allowed number of file systems. All of the mount
+    // requests should succeed, except the last one which should fail with a
+    // security error.
+    var ALREADY_MOUNTED_FILE_SYSTEMS = 2;  // By previous tests.
+    var MAX_FILE_SYSTEMS = 16;
+    var index = 0;
+    var tryNextOne = function() {
+      index++;
+      if (index < MAX_FILE_SYSTEMS - ALREADY_MOUNTED_FILE_SYSTEMS + 1) {
+        chrome.fileSystemProvider.mount(
+            index + 'th file system',
+            function(fileSystemId) {
+              chrome.test.assertTrue(fileSystemId != '');
+              tryNextOne();
+            },
+            chrome.test.fail);
+      } else {
+        chrome.fileSystemProvider.mount(
+            'over the limit fs',
+            chrome.test.fail,
+            function(error) {
+              chrome.test.assertEq('SecurityError', error.name);
+              chrome.test.succeed();
+            });
+      }
+    };
+    tryNextOne();
+  }
 ]);