Update Google Input Tools.

third_party/google_input_tools/src/chrome/os/common.js

 // Copyright 2015 The ChromeOS IME Authors. All Rights Reserved.
 // limitations under the License.
 // See the License for the specific language governing permissions and
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // distributed under the License is distributed on an "AS-IS" BASIS,
 // Unless required by applicable law or agreed to in writing, software
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // You may obtain a copy of the License at
@@ skipping 25 matching lines @@
   ENTRIES: 'entries',
   FREQUENCY: 'frequency',
   FUZZY_PAIRS: 'fuzzy_pairs',
   KEYBOARD_LAYOUT: 'keyboard_layout',
   HIGHLIGHT: 'highlight',
   HIGHLIGHT_INDEX: 'highlight_index',
   IME: 'itc',
   MIN_SCORE: 'min_score',
   MULTI: 'multi',
   MULTI_APPEND: 'multi_append',
+  PRECEDING_TEXT: 'preceding_text',
   PREDICT: 'predict',
   REVERT: 'revert',
   SELECT: 'select',
   SELECT_HIGHLIGHT: 'select_highlight',
   SOURCE: 'source',
   TARGET: 'target',
   UPDATE_ALL: 'update_all',
   USER_DICT: 'user_dict'
 };
 
 
 /**
  * The trigger types for committing text.
  *
  * @enum {number}
  */
 i18n.input.chrome.TriggerType = {
   SPACE: 0,
   RESET: 1,
   CANDIDATE: 2,
   SYMBOL_OR_NUMBER: 3,
   DOUBLE_SPACE_TO_PERIOD: 4,
   REVERT: 5,
   VOICE: 6,
   COMPOSITION_DISABLED: 7,
   GESTURE: 8,
   UNKNOWN: -1
 };