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

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index 6c003df44620f384a828e460fbba36473f982419..8f6288cb84399ae0b298ce78f2ced66e6f147d70 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -110,7 +110,9 @@ class ContentViewCoreImpl : public ContentViewCore,
                         jfloat touch_major_0,
                         jfloat touch_major_1,
                         jfloat raw_pos_x,
-                        jfloat raw_pos_y);
+                        jfloat raw_pos_y,
+                        jint android_tool_type,
+                        jint android_button_state);
   jboolean SendMouseMoveEvent(JNIEnv* env,
                               jobject obj,
                               jlong time_ms,
@@ -374,6 +376,9 @@ class ContentViewCoreImpl : public ContentViewCore,
 
   bool accessibility_enabled_;
 
+  int mouse_drag_start_x_;
+  int mouse_drag_start_y_;
+
   // Manages injecting Java objects.
   scoped_ptr<JavaBridgeDispatcherHostManager>
       java_bridge_dispatcher_host_manager_;