Added code to dismiss url suggestion popup on back key press.

chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java

Index: chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java
diff --git a/chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java b/chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java
index a88405063d3727f264b9f1226c9c57c1cb2bc31c..c04d8c57ec939c203c17858ff6f72aaf897bf5dd 100644
--- a/chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java
+++ b/chrome/android/shell/java/src/org/chromium/chrome/shell/ChromeShellToolbar.java
@@ -140,6 +140,19 @@ public class ChromeShellToolbar extends LinearLayout {
                 }
             }
         });
+        mUrlTextView.setOnKeyListener(new OnKeyListener() {
+            @Override
+            public boolean onKey(View v, int keyCode, KeyEvent event) {
+                if (event != null && keyCode == KeyEvent.KEYCODE_BACK) {

[Bernhard Bauer, 2014/08/26 07:46:10]

Is this actually called with a null event?

[ankit, 2014/08/26 08:16:32]

I did not encounter any scenario when it was getting 
called with null event. Just to be on safer side I added
it. Please suggest if it is not required.

[Bernhard Bauer, 2014/08/26 08:20:43]

I would rather not add it. Your assumption (and mine) is that this is never
called with null, but if it were, you wouldn't find out, because you're silently
handling that case. If we remove the null check, the assumption is made clear,
and if it's violated, we will get crash reports.

+                    mUrlTextView.clearFocus();
+                    if (mTab != null) {
+                        mTab.getView().requestFocus();
+                    }
+                    return true;
+                }
+                return false;
+            }
+        });
 
         mSuggestionPopup = new SuggestionPopup(getContext(), mUrlTextView, this);
         mUrlTextView.addTextChangedListener(mSuggestionPopup);