Autofill: Add log about prediction availability when autofill starts

This will help test team to verify if the feature is enabled or not.

Bug: 1169367
Change-Id: I1d731b00c30080a9f3d37ddce36ab642140990c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643705Reviewed-by: Michael Bai <michaelbai@chromium.org>
Reviewed-by: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Michael Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846197}

android_webview/javatests/src/org/chromium/android_webview/test/AwAutofillTest.java

@@ -540,7 +540,7 @@ public class AwAutofillTest {
         }
 
         @Override
-        public void notifyNewSessionStarted() {
+        public void notifyNewSessionStarted(boolean hasServerPrediction) {
             if (DEBUG) Log.i(TAG, "notifyNewSessionStarted");
             mEventQueue.add(AUTOFILL_SESSION_STARTED);
             mCallbackHelper.notifyCalled();

components/autofill/android/provider/java/src/org/chromium/components/autofill/AutofillManagerWrapper.java

@@ -190,9 +190,9 @@ public class AutofillManagerWrapper {
         }
     }
 
-    public void notifyNewSessionStarted() {
+    public void notifyNewSessionStarted(boolean hasServerPrediction) {
         updateLogStat();
-        if (isLoggable()) log("Session starts");
+        if (isLoggable()) log("Session starts, has server prediction = " + hasServerPrediction);
     }
 
     public void onQueryDone(boolean success) {

components/autofill/android/provider/java/src/org/chromium/components/autofill/AutofillProvider.java

@@ -450,7 +450,7 @@ public class AutofillProvider {
         }
         mAutofillTriggeredTimeMillis = System.currentTimeMillis();
 
-        mAutofillManager.notifyNewSessionStarted();
+        mAutofillManager.notifyNewSessionStarted(hasServerPrediction);
     }
 
     /**