VR: Show autofill popup on first touch

The VR keyboard doesn't take content space, so we don't need to wait
for a window resize to do the auto-scroll to the focused view. We
add a new parameter to the result receiver to indicate this.

Bug: 831368
Change-Id: I3d965ef9ffec8288ca2f6acc91c5f4fda8fc23f6
Reviewed-on: https://chromium-review.googlesource.com/1127928Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Amirhossein Simjour <asimjour@chromium.org>
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575009}

chrome/android/java/src/org/chromium/chrome/browser/vr/keyboard/VrInputMethodManagerWrapper.java

@@ -10,6 +10,7 @@ import android.os.ResultReceiver;
 import android.view.View;
 import android.view.inputmethod.CursorAnchorInfo;
 import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputMethodManager;
 
 import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
@@ -67,6 +68,10 @@ public class VrInputMethodManagerWrapper implements InputMethodManagerWrapper {
         EditorInfo outAttrs = new EditorInfo();
         view.onCreateInputConnection(outAttrs);
         mKeyboard.showSoftInput(true);
+
+        // Since the VR keyboard doesn't take content space, we report back to the ImeAdapter that
+        // the keyboard was always showing.
+        resultReceiver.send(InputMethodManager.RESULT_UNCHANGED_SHOWN, null);
     }
 
     @Override

content/public/android/java/src/org/chromium/content/browser/input/ImeAdapterImpl.java

@@ -542,6 +542,8 @@ public class ImeAdapterImpl implements ImeAdapter, WindowEventObserver {
         } else if (ViewUtils.hasFocus(containerView)
                 && resultCode == InputMethodManager.RESULT_UNCHANGED_SHOWN) {
             // If the OSK was already there, focus the form immediately.
+            // Also, the VR soft keyboard always reports RESULT_UNCHANGED_SHOWN as it
+            // doesn't affect the size of the web contents.
             mWebContents.scrollFocusedEditableNodeIntoView();
         }
     }