Intercept WebVR api calls and check for VrCore compatibility.

chrome/browser/android/vr_shell/vr_shell_delegate.cc

Index: chrome/browser/android/vr_shell/vr_shell_delegate.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_delegate.cc b/chrome/browser/android/vr_shell/vr_shell_delegate.cc
index 3a4e46942bbac967dbaf5b03ab8acdcdde500c27..9648346b2cca9cf4446f5d5f8ffc70fe15d07579 100644
--- a/chrome/browser/android/vr_shell/vr_shell_delegate.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_delegate.cc
@@ -125,6 +125,12 @@ void VrShellDelegate::ShowTab(int id) {
 
 void VrShellDelegate::SetDeviceProvider(
     device::GvrDeviceProvider* device_provider) {
+  JNIEnv* env = AttachCurrentThread();
+  bool vrCorecompatible = static_cast<bool>(
+      Java_VrShellDelegate_isVrCoreCompatible(env, j_vr_shell_delegate_.obj()));
+  if (!vrCorecompatible)
+    return;
+
   CHECK(!device_provider_);
   device_provider_ = device_provider;
   if (!delegate_)
@@ -133,11 +139,14 @@ void VrShellDelegate::SetDeviceProvider(
 }
 
 void VrShellDelegate::ClearDeviceProvider() {
-  non_presenting_delegate_ = nullptr;
-  JNIEnv* env = AttachCurrentThread();
-  Java_VrShellDelegate_shutdownNonPresentingNativeContext(
-      env, j_vr_shell_delegate_.obj());
-  device_provider_->Device()->OnDelegateChanged();
+  // Clean up the non-presenting delegate.
+  if (non_presenting_delegate_) {
+    non_presenting_delegate_ = nullptr;
+    JNIEnv* env = AttachCurrentThread();
+    Java_VrShellDelegate_shutdownNonPresentingNativeContext(
+        env, j_vr_shell_delegate_.obj());
+    device_provider_->Device()->OnDelegateChanged();
+  }
   device_provider_ = nullptr;
 }