[Android] Restart input only once on focus change

content/renderer/render_widget.cc

 // Copyright (c) 2012 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 "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 1012 matching lines @@
   // Nothing to do here. RenderWidget created the |input_handler| and will take
   // ownership of it. We just verify here that we don't already have an input
   // handler.
   DCHECK(!input_handler_);
 }
 
 void RenderWidget::ShowVirtualKeyboard() {
   UpdateTextInputStateInternal(true, false);
 }
 
+void RenderWidget::ClearTextInputState() {
+  text_input_info_ = blink::WebTextInputInfo();
+  text_input_type_ = ui::TextInputType::TEXT_INPUT_TYPE_NONE;
+  text_input_mode_ = ui::TextInputMode::TEXT_INPUT_MODE_DEFAULT;
+  can_compose_inline_ = false;
+  text_input_flags_ = 0;
+}
+
 void RenderWidget::UpdateTextInputState() {
   UpdateTextInputStateInternal(false, false);
 }
 
 void RenderWidget::UpdateTextInputStateInternal(bool show_virtual_keyboard,
                                                 bool reply_to_request) {
   TRACE_EVENT0("renderer", "RenderWidget::UpdateTextInputState");
 
   if (ime_event_guard_) {
     DCHECK(!reply_to_request);
@@ skipping 1041 matching lines @@
       break;
     default:
       web_screen_info.orientationType =
           blink::WebScreenOrientationUndefined;
       break;
   }
   web_screen_info.orientationAngle = screen_info_.orientation_angle;
   return web_screen_info;
 }
 
-void RenderWidget::resetInputMethod() {
-  ImeEventGuard guard(this);
-  Send(new InputHostMsg_ImeCancelComposition(routing_id()));
-
-  UpdateCompositionInfo(false /* not an immediate request */);
-}
-
 #if defined(OS_ANDROID)
 void RenderWidget::showUnhandledTapUIIfNeeded(
     const WebPoint& tapped_position,
     const WebNode& tapped_node,
     bool page_changed) {
   DCHECK(input_handler_->handling_input_event());
   bool should_trigger = !page_changed && tapped_node.isTextNode() &&
                         !tapped_node.isContentEditable() &&
                         !tapped_node.isInsideFocusableElementOrARIAWidget();
   if (should_trigger) {
@@ skipping 160 matching lines @@
     // browser side (https://crbug.com/669219).
     // If there is no WebFrameWidget, then there will be no
     // InputMethodControllers for a WebLocalFrame.
     return nullptr;
   }
   return static_cast<blink::WebFrameWidget*>(GetWebWidget())
       ->getActiveWebInputMethodController();
 }
 
 }  // namespace content