Decouple VR Shell DPR and CSS size from Physical Displays.

chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc

Index: chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
diff --git a/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc b/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
index 7eb33f110f6836998ec784e8f325605d9862e22a..02ec68557e732153f2b1086a1f6641632ffc93a6 100644
--- a/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
+++ b/chrome/browser/ui/webui/vr_shell/vr_shell_ui_message_handler.cc
@@ -35,6 +35,9 @@ void VrShellUIMessageHandler::RegisterMessages() {
   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) {
@@ -72,6 +75,17 @@ void VrShellUIMessageHandler::HandleDoAction(const base::ListValue* args) {
   }
 }
 
+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);
 }