[WIP] Add support for Android SuggestionSpans when editing text

content/renderer/input/render_widget_input_handler.cc

 // Copyright 2015 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/input/render_widget_input_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 402 matching lines @@
         ->DidHandleInputEventOnMainThread(input_event);
   }
 
 #if defined(OS_ANDROID)
   // Allow the IME to be shown when the focus changes as a consequence
   // of a processed touch end event.
   if (input_event.type() == WebInputEvent::TouchEnd &&
       processed != WebInputEventResult::NotHandled) {
     delegate_->ShowVirtualKeyboard();
   }
+
+  if (input_event.type() == WebInputEvent::GestureTap) {

[aelias_OOO_until_Jul13, 2017/01/25 03:34:26]

This handler is too generica place to put this, please place it in the handler
responsible for actually moving the caret around, after already hit tested into
a textbox.

[rlanday, 2017/01/26 01:29:07]

That would be SelectionController::handleMousePressEventSingleClick() I
guess...I think I stuck this here because it was the last point at which we have
access to the RenderWidgetInputHandlerDelegate which we need to have send the
IPC call up. After this we're in third_party/WebKit. I can't get access to the
delegate from there, can I?

[aelias_OOO_until_Jul13, 2017/01/26 02:00:30]

You can just add a new abstract method in third_party/WebKit/Source/public/ to
access RenderWidget stuff.  There is no hard boundary here, the distinction
between what goes in chromium and what goes in WebKit is somewhat historic.

+    delegate_->HandlePotentialTextSuggestionTap();
+  }
 #elif defined(USE_AURA)
   // Show the virtual keyboard if enabled and a user gesture triggers a focus
   // change.
   if (processed != WebInputEventResult::NotHandled &&
       (input_event.type() == WebInputEvent::TouchEnd ||
        input_event.type() == WebInputEvent::MouseUp)) {
     delegate_->ShowVirtualKeyboard();
   }
 #endif
 
@@ skipping 31 matching lines @@
   // it can be bundled in the event ack.
   if (handling_event_overscroll_) {
     *handling_event_overscroll_ = std::move(params);
     return;
   }
 
   delegate_->OnDidOverscroll(*params);
 }
 
 }  // namespace content