[Autofill Assistant] Only enable when Intent contains a special parameter.

With this change, Autofill Assistant only runs when the feature is
enabled and the Intent contains:
org.chromium.chrome.browser.autofill_assistant.ENABLED.

Bug: 806868
Change-Id: I6bc81181b9f16a2d13e56ff657c6bd9076621808
Reviewed-on: https://chromium-review.googlesource.com/1254281
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595754}

chrome/android/java/src/org/chromium/chrome/browser/autofill_assistant/AutofillAssistantUiController.java

@@ -36,6 +36,9 @@ public class AutofillAssistantUiController implements AutofillAssistantUiDelegat
     /** Variation url parameter name. */
     private static final String URL_PARAMETER_NAME = "url";
 
+    /** Special parameter that enables the feature. */
+    private static final String PARAMETER_ENABLED = "ENABLED";
+
     private final long mUiControllerAndroid;
     private final AutofillAssistantUiDelegate mUiDelegate;
 
@@ -44,8 +47,9 @@ public class AutofillAssistantUiController implements AutofillAssistantUiDelegat
      *
      * @return True if a controller can be constructed.
      */
-    public static boolean isConfigured() {
-        return !VariationsAssociatedData.getVariationParamValue(STUDY_NAME, URL_PARAMETER_NAME)
+    public static boolean isConfigured(Bundle intentExtras) {
+        return getBooleanParameter(intentExtras, PARAMETER_ENABLED)
+                && !VariationsAssociatedData.getVariationParamValue(STUDY_NAME, URL_PARAMETER_NAME)
                             .isEmpty();
     }
 
@@ -59,10 +63,9 @@ public class AutofillAssistantUiController implements AutofillAssistantUiDelegat
         // nativeInit already.
         mUiDelegate = new AutofillAssistantUiDelegate(activity, this);
 
-        // TODO(crbug.com/806868): Treat parameter
-        // org.chromium.chrome.browser.autofill_assistant.ENABLED specially, and disable autofill
-        // assistant if it is false or unset.
         Map<String, String> parameters = extractParameters(activity.getInitialIntent().getExtras());
+        parameters.remove(PARAMETER_ENABLED);
+
         Tab activityTab = activity.getActivityTab();
         mUiControllerAndroid = nativeInit(activityTab.getWebContents(),
                 parameters.keySet().toArray(new String[parameters.size()]),
@@ -105,6 +108,11 @@ public class AutofillAssistantUiController implements AutofillAssistantUiDelegat
         nativeOnScriptSelected(mUiControllerAndroid, scriptPath);
     }
 
+    /** Return the value if the given boolean parameter from the extras. */
+    private static boolean getBooleanParameter(Bundle extras, String parameterName) {
+        return extras.getBoolean(INTENT_EXTRA_PREFIX + parameterName, false);
+    }
+
     /** Returns a map containing the extras starting with {@link #INTENT_EXTRA_PREFIX}. */
     private static Map<String, String> extractParameters(Bundle extras) {
         Map<String, String> result = new HashMap<>();

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java

@@ -680,11 +680,9 @@ public class CustomTabActivity extends ChromeActivity<CustomTabActivityComponent
                     getActivityTab().getWebContents());
         }
 
-        // TODO(crbug.com/806868): Only enable Autofill Assistant when the flag is enabled in the
-        // intent.
         if (mAutofillAssistantUiController == null
                 && ChromeFeatureList.isEnabled(ChromeFeatureList.AUTOFILL_ASSISTANT)
-                && AutofillAssistantUiController.isConfigured()) {
+                && AutofillAssistantUiController.isConfigured(getInitialIntent().getExtras())) {
             mAutofillAssistantUiController = new AutofillAssistantUiController(this);
         }