Add support for Android spellcheck menu in Chrome/WebViews

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index af376b96993a4f7f6aa8c9b6e4b5181a06093b2c..ce46113bf3dd447e553dc8313833a342a5588ce0 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -938,6 +938,11 @@ bool RenderWidgetHostViewAndroid::OnTouchEvent(
 
   ComputeEventLatencyOSTouchHistograms(event);
 
+  // Receiving any other touch event before the double-tap timeout expires

[rlanday, 2017/06/07 04:03:54]

This matches the behavior of the native Android text box:
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/...

However, the native Android text box exhibits seriously buggy behavior if you
tap on a misspelled word and then keep typing (in most cases the spellcheck
marker is cleared from the edit, and it tries to do the highlight + open the
menu at the last location the menu was opened at; sometimes a crash even
results). So it might be prudent to also clear the timer on a keyboard event.

(Note for Googlers: Filed the Android bug as b/62392030)

+  // cancels opening the spellcheck menu.
+  if (ime_adapter_android_)
+    ime_adapter_android_->StopSpellCheckMenuTimer();
+
   // If a browser-based widget consumes the touch event, it's critical that
   // touch event interception be disabled. This avoids issues with
   // double-handling for embedder-detected gestures like side swipe.