Implement chrome.input.ime.setComposition/commitText API.

chrome/browser/ui/input_method/input_method_engine_base.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/input_method/input_method_engine_base.h"
 
 #undef FocusIn
 #undef FocusOut
 #undef RootWindow
 #include <algorithm>
@@ skipping 231 matching lines @@
         break;
       default:
         continue;
     }
 
     underline.start_offset = segment->start;
     underline.end_offset = segment->end;
     composition_text_->underlines.push_back(underline);
   }
 
+  // Use a black thin underline by default.
+  if (composition_text_->underlines.empty()) {
+    composition_text_->underlines.push_back(ui::CompositionUnderline(
+        0, composition_text_->text.length(), SK_ColorBLACK, false /* thick */,
+        SK_ColorTRANSPARENT));
+  }
+
   // TODO(nona): Makes focus out mode configuable, if necessary.
   UpdateComposition(*composition_text_, composition_cursor_, true);
   return true;
 }
 
 bool InputMethodEngineBase::ClearComposition(int context_id,
                                              std::string* error) {
   if (!IsActive()) {
     *error = kErrorNotActive;
     return false;
@@ skipping 133 matching lines @@
 void InputMethodEngineBase::SetSurroundingText(const std::string& text,
                                                uint32_t cursor_pos,
                                                uint32_t anchor_pos,
                                                uint32_t offset_pos) {
   observer_->OnSurroundingTextChanged(
       active_component_id_, text, static_cast<int>(cursor_pos),
       static_cast<int>(anchor_pos), static_cast<int>(offset_pos));
 }
 
 }  // namespace input_method