[Android] Select text when stylus first button is pressed.

content/browser/renderer_host/input/web_input_event_util.cc

Index: content/browser/renderer_host/input/web_input_event_util.cc
diff --git a/content/browser/renderer_host/input/web_input_event_util.cc b/content/browser/renderer_host/input/web_input_event_util.cc
index 5994b7ffd6ad5ec99d337ce4f6aad98621e87332..d419802be9e32503a47accf8fee399f7d158b367 100644
--- a/content/browser/renderer_host/input/web_input_event_util.cc
+++ b/content/browser/renderer_host/input/web_input_event_util.cc
@@ -11,6 +11,7 @@
 
 using blink::WebGestureEvent;
 using blink::WebInputEvent;
+using blink::WebMouseEvent;
 using blink::WebTouchEvent;
 using blink::WebTouchPoint;
 using ui::MotionEvent;
@@ -213,6 +214,46 @@ void UpdateWindowsKeyCodeAndKeyIdentifier(blink::WebKeyboardEvent* event,
   }
 }
 
+blink::WebMouseEvent CreateWebMouseEventFromMotionEvent(
+    const ui::MotionEvent& event) {
+  blink::WebMouseEvent result;
+  result.type = WebInputEvent::MouseMove;
+  switch (event.GetAction()) {
+    case MotionEvent::ACTION_DOWN: {
+      result.type = WebInputEvent::MouseDown;
+      result.modifiers |= WebInputEvent::LeftButtonDown;
+      result.clickCount = 1;
+      break;
+    }
+    case MotionEvent::ACTION_UP:
+    case MotionEvent::ACTION_CANCEL: {
+      result.type = WebInputEvent::MouseUp;
+      result.clickCount = 1;
+      break;
+    }
+    case MotionEvent::ACTION_MOVE: {
+      result.type = WebInputEvent::MouseMove;
+      result.modifiers |= WebInputEvent::LeftButtonDown;
+      break;
+    }
+    default: {
+    }
+  }
+  result.timeStampSeconds =
+      (event.GetEventTime() - base::TimeTicks()).InSecondsF();
+  result.x = event.GetX();
+  result.y = event.GetY();
+  result.windowX = event.GetX();
+  result.windowY = event.GetY();
+
+  if (result.type == WebInputEvent::MouseDown ||
+      result.type == WebInputEvent::MouseUp)
+    result.button = WebMouseEvent::ButtonLeft;
+  else
+    result.button = WebMouseEvent::ButtonNone;
+  return result;
+}
+
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
     const ui::MotionEvent& event) {
   blink::WebTouchEvent result;