Add a Kill switch for WebVR cardboard support through finch.

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index d237ad8568adf7c7ffb4a08821225a572ea4eb5b..c2886e36435f92531e3a93f426af1bd11f82b67e 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -11,6 +11,7 @@
 #include "base/android/jni_string.h"
 #include "base/feature_list.h"
 #include "base/macros.h"
+#include "base/metrics/field_trial_params.h"
 #include "chrome/common/chrome_features.h"
 #include "components/autofill/core/browser/autofill_experiments.h"
 #include "components/ntp_snippets/features.h"
@@ -60,6 +61,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &kTabReparenting,
     &kWebPaymentsModifiers,
     &kWebPaymentsSingleAppUiSkip,
+    &kWebVRCardboardSupport,
     &ntp_snippets::kIncreasedVisibility,
     &ntp_snippets::kForeignSessionsSuggestionsFeature,
     &ntp_snippets::kOfflineBadgeFeature,
@@ -144,6 +146,9 @@ const base::Feature kWebPaymentsModifiers{"WebPaymentsModifiers",
 const base::Feature kWebPaymentsSingleAppUiSkip{
     "WebPaymentsSingleAppUiSkip", base::FEATURE_ENABLED_BY_DEFAULT};
 
+const base::Feature kWebVRCardboardSupport{
+    "WebVRCardboardSupport", base::FEATURE_ENABLED_BY_DEFAULT};
+
 static jboolean IsEnabled(JNIEnv* env,
                           const JavaParamRef<jclass>& clazz,
                           const JavaParamRef<jstring>& jfeature_name) {
@@ -157,6 +162,26 @@ static jboolean IsEnabled(JNIEnv* env,
   return false;
 }
 
+static jint GetFieldTrialParamByFeatureAsInt(
+    JNIEnv* env,
+    const JavaParamRef<jclass>& clazz,
+    const JavaParamRef<jstring>& jfeature_name,
+    const JavaParamRef<jstring>& jparam_name,
+    const jint jdefault_value) {
+  const std::string feature_name = ConvertJavaStringToUTF8(env, jfeature_name);
+  const std::string param_name = ConvertJavaStringToUTF8(env, jparam_name);
+  int default_value = static_cast<int>(jdefault_value);
+
+  for (size_t i = 0; i < arraysize(kFeaturesExposedToJava); ++i) {
+    if (kFeaturesExposedToJava[i]->name == feature_name)
+      return base::GetFieldTrialParamByFeatureAsInt(
+          *kFeaturesExposedToJava[i], param_name, default_value);
+  }
+  // Features queried via this API must be present in |kFeaturesExposedToJava|.
+  NOTREACHED();
+  return jdefault_value;
+}
+
 bool RegisterChromeFeatureListJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }