Allow tap gestures to open the IME on Android.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 119c651aa5b56eecdd929641037a933de78b8770..7c9366d0c0b79190da3d97310f734fd07bd28f9e 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -349,9 +349,16 @@ class CONTENT_EXPORT RenderWidget
     throttle_input_events_ = throttle_input_events;
   }
 
+  enum ShowIme {
+    DO_NOT_SHOW_IME,
+    SHOW_IME_IF_NEEDED
+  };
+
   // Checks if the text input state and compose inline mode have been changed.
   // If they are changed, the new value will be sent to the browser process.
-  void UpdateTextInputState();
+  // |show_ime_if_needed| should be SHOW_IME_IF_NEEDED iff the update may cause
+  // the ime to be displayed, e.g. after a tap on an input field on mobile.
+  void UpdateTextInputState(ShowIme show_ime);
 
   // Checks if the selection bounds have been changed. If they are changed,
   // the new value will be sent to the browser process.