VR: Stop sending mouse moves while mouse is down to content window.

chrome/browser/android/vr_shell/vr_shell_gl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/vr_shell_gl.h"
 
 #include <chrono>
 #include <limits>
 #include <utility>
 
@@ skipping 726 matching lines @@
   }
   hover_target_ = target;
   return true;
 }
 
 void VrShellGl::SendHoverMove(const gfx::PointF& target_point,
                               const gfx::Point& local_point_pixels) {
   if (!hover_target_)
     return;
   if (hover_target_->fill() == Fill::CONTENT) {
+    // TODO(mthiesse, vollick): Content is currently way too sensitive to mouse
+    // moves for how noisy the controller is. It's almost impossible to click a
+    // link without unintentionally starting a drag event. For this reason we
+    // disable mouse moves, only delivering a down and up event.
+    if (in_click_)
+      return;
     SendGestureToContent(MakeMouseEvent(blink::WebInputEvent::kMouseMove,
                                         NowSeconds(), local_point_pixels,
                                         in_click_));
   } else {
     hover_target_->OnMove(target_point);
   }
 }
 
 void VrShellGl::SendButtonDown(UiElement* target,
                                const gfx::PointF& target_point,
@@ skipping 865 matching lines @@
   // This assumes that the initial webvr_surface_size_ was set to the
   // appropriate recommended render resolution as the default size during
   // InitializeGl. Revisit if the initialization order changes.
   device::mojom::VRDisplayInfoPtr info =
       device::GvrDelegate::CreateVRDisplayInfo(gvr_api_.get(),
                                                webvr_surface_size_, device_id);
   browser_->RunVRDisplayInfoCallback(callback, &info);
 }
 
 }  // namespace vr_shell