WebVR: enable Cardboard button compatibility

chrome/browser/android/vr_shell/vr_shell.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.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "chrome/browser/android/vr_shell/ui_elements.h"
 #include "chrome/browser/android/vr_shell/ui_interface.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
@@ skipping 575 matching lines @@
 
   // Update the render position of all UI elements (including desktop).
   const float screen_tilt = kDesktopScreenTiltDefault * M_PI / 180.0f;
   scene_->UpdateTransforms(screen_tilt, UiScene::TimeInMicroseconds());
 
   UpdateController(GetForwardVector(head_pose));
 
   if (html_interface_->GetMode() == UiInterface::Mode::WEB_VR) {
     DrawWebVr();
 
+    // Process screen touch events for Cardboard button compatibility.
+    if (touch_pending_) {

[bajones, 2016/11/17 20:42:53]

Shouldn't this go in UpdateController under the if (html_interface_->GetMode()
== UiInterface::Mode::WEB_VR) branch?

[klausw, 2016/11/17 21:00:00]

Yes, that's a much better fit. Moved.

+      touch_pending_ = false;
+      std::unique_ptr<WebGestureEvent> gesture(new WebGestureEvent());
+      gesture->sourceDevice = blink::WebGestureDeviceTouchpad;
+      gesture->timeStampSeconds =
+          (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
+      gesture->type = WebInputEvent::GestureTapDown;
+      gesture->data.tapDown.width = 0;
+      gesture->data.tapDown.height = 0;
+      content_input_manager_->ProcessUpdatedGesture(*gesture.get());
+    }
+
     // When using async reprojection, we need to know which pose was used in
     // the WebVR app for drawing this frame. Due to unknown amounts of
     // buffering in the compositor and SurfaceTexture, we read the pose number
     // from a corner pixel. There's no point in doing this for legacy
     // distortion rendering since that doesn't need a pose, and reading back
     // pixels is an expensive operation. TODO(klausw,crbug.com/655722): stop
     // doing this once we have working no-compositor rendering for WebVR.
     if (gvr_api_->GetAsyncReprojectionEnabled()) {
       uint32_t webvr_pose_frame = GetPixelEncodedPoseIndex();
       // If we don't get a valid frame ID back we shouldn't attempt to reproject
@@ skipping 422 matching lines @@
            const JavaParamRef<jobject>& ui_web_contents,
            jlong ui_window_android) {
   return reinterpret_cast<intptr_t>(new VrShell(
       env, obj, content::WebContents::FromJavaWebContents(content_web_contents),
       reinterpret_cast<ui::WindowAndroid*>(content_window_android),
       content::WebContents::FromJavaWebContents(ui_web_contents),
       reinterpret_cast<ui::WindowAndroid*>(ui_window_android)));
 }
 
 }  // namespace vr_shell