[WIP] Add support for Android SuggestionSpans when editing text

content/renderer/input/render_widget_input_handler.cc

Index: content/renderer/input/render_widget_input_handler.cc
diff --git a/content/renderer/input/render_widget_input_handler.cc b/content/renderer/input/render_widget_input_handler.cc
index f6f161d0cfb6b39ccb48f69dd23eefab2c029cad..919636ff06a338ad97081b5021cc8902c5532d55 100644
--- a/content/renderer/input/render_widget_input_handler.cc
+++ b/content/renderer/input/render_widget_input_handler.cc
@@ -420,6 +420,10 @@ void RenderWidgetInputHandler::HandleInputEvent(
       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.