(Android) Fix Bluetooth keyboard focus issues in settings

chrome/android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java

Index: chrome/android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java b/chrome/android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java
index 97a68d330ee3a1404db8d99c71f9504d6c8d4117..d93ea96758fd19f9c19edb70c855beceb257d116 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/JavascriptAppModalDialog.java
@@ -142,6 +142,21 @@ public class JavascriptAppModalDialog implements DialogInterface.OnClickListener
             layout.findViewById(R.id.js_modal_dialog_scroll_view).setVisibility(View.GONE);
         } else {
             ((TextView) layout.findViewById(R.id.js_modal_dialog_message)).setText(mMessage);
+
+            layout.findViewById(R.id.js_modal_dialog_message)
+                    .addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
+                        @Override
+                        public void onLayoutChange(View v, int left, int top, int right, int bottom,
+                                int oldLeft, int oldTop, int oldRight, int oldBottom) {
+                            final View scrollView =
+                                    layout.findViewById(R.id.js_modal_dialog_scroll_view);
+                            int messageHeight = bottom - top + scrollView.getPaddingTop()
+                                    + scrollView.getPaddingBottom();
+                            boolean isScrollable = scrollView.getHeight() < messageHeight;
+
+                            scrollView.setFocusable(isScrollable);
+                        }
+                    });
         }
     }