Decouple VR Shell DPR and CSS size from Physical Displays.

chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.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/ui/webui/vr_shell/vr_shell_ui_message_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 17 matching lines @@
 
   web_ui()->RegisterMessageCallback(
       "domLoaded", base::Bind(&VrShellUIMessageHandler::HandleDomLoaded,
                               base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "updateScene", base::Bind(&VrShellUIMessageHandler::HandleUpdateScene,
                             base::Unretained(this)));
   web_ui()->RegisterMessageCallback(
       "doAction", base::Bind(&VrShellUIMessageHandler::HandleDoAction,
                              base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(
+      "setUiCssSize", base::Bind(&VrShellUIMessageHandler::HandleSetUiCssSize,
+                                 base::Unretained(this)));
 }
 
 void VrShellUIMessageHandler::HandleDomLoaded(const base::ListValue* args) {
   AllowJavascript();
 }
 
 void VrShellUIMessageHandler::OnJavascriptAllowed() {
   // If we don't have a VR Shell here, it means either the user manually loaded
   // this webui page and we want to silently fail to connect to native vr shell,
   // or VR Shell was deleted, and this webui content is also about to be
@@ skipping 17 matching lines @@
 }
 
 void VrShellUIMessageHandler::HandleDoAction(const base::ListValue* args) {
   int action;
   CHECK(args->GetInteger(0, &action));
   if (vr_shell_) {
     vr_shell_->DoUiAction((vr_shell::UiAction) action);
   }
 }
 
+void VrShellUIMessageHandler::HandleSetUiCssSize(const base::ListValue* args) {
+  CHECK(args->GetSize() == 3);
+  double width, height, dpr;
+  CHECK(args->GetDouble(0, &width));
+  CHECK(args->GetDouble(1, &height));
+  CHECK(args->GetDouble(2, &dpr));
+  if (vr_shell_) {
+    vr_shell_->SetUiCssSize(width, height, dpr);
+  }
+}
+
 void VrShellUIMessageHandler::SendCommandToUi(const base::Value& value) {
   CallJavascriptFunction("vrShellUi.command", value);
 }