Intercept WebVR api calls and check for VrCore compatibility.

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java
index a0a777932555f6ed03328dc1efc47c6e189236f9..dfb25f3132acb12610dd6da5e27f9f8e2966ad1d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrCoreVersionCheckerImpl.java
@@ -4,6 +4,8 @@
 
 package org.chromium.chrome.browser.vr_shell;
 
+import android.os.Build;
+
 import com.google.vr.ndk.base.Version;
 import com.google.vr.vrcore.base.api.VrCoreNotAvailableException;
 import com.google.vr.vrcore.base.api.VrCoreUtils;
@@ -11,14 +13,26 @@ import com.google.vr.vrcore.base.api.VrCoreUtils;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 
+import org.chromium.chrome.browser.ChromeFeatureList;
+
 /**
  * Helper class to check if VrCore version is compatible with Chromium.
  */
 public class VrCoreVersionCheckerImpl implements VrCoreVersionChecker {
     private static final String TAG = "VrCoreVersionChecker";
 
+    private static final String MIN_SDK_VERSION_PARAM_NAME = "min_sdk_version";
+
     @Override
     public int getVrCoreCompatibility() {
+        // Supported Build version is determined by the webvr cardboard support feature.
+        // Default is KITKAT unless specified via server side finch config.
+        if (Build.VERSION.SDK_INT < ChromeFeatureList.getFieldTrialParamByFeatureAsInt(
+                                            ChromeFeatureList.WEBVR_CARDBOARD_SUPPORT,
+                                            MIN_SDK_VERSION_PARAM_NAME,
+                                            Build.VERSION_CODES.KITKAT)) {
+            return VrCoreVersionChecker.VR_NOT_SUPPORTED;
+        }
         try {
             String vrCoreSdkLibraryVersionString = VrCoreUtils.getVrCoreSdkLibraryVersion(
                     ContextUtils.getApplicationContext());