Adds selection expansion support for Contextual Search.

content/public/android/java/src/org/chromium/content_public/browser/WebContents.java

Index: content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
diff --git a/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java b/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
index 0fb58a0ac4da5cfbc76719e104e64f060ccbafca..3b90e79269d8a5cd58701518b4dd1b89005a940a 100644
--- a/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
+++ b/content/public/android/java/src/org/chromium/content_public/browser/WebContents.java
@@ -179,6 +179,15 @@ public interface WebContents extends Parcelable {
     void selectWordAroundCaret();
 
     /**
+     * Adjusts the selection starting and ending points by the given amount.
+     * A negative amount moves the selection towards the beginning of the document, a positive

[palmer, 2015/07/07 18:40:00]

I may be missing a detail, but elsewhere you state
(ContextualSearchManager.java) and enforce (contextual_search_delegate.cc) that
these values are >= 0. Or, are these different values? The names are similar so
I'm a bit confused.

[aurimas (slooooooooow), 2015/07/09 00:20:50]

Sorry for the confusion. This patch went through changes and it did not get
fully updated everywhere. It went through allowing contracting the selection ->
only expansion -> and now in my latest CL it allows to contract again. Final
state is to allow selection contraction as it turns out in Korean Chrome tends
to select several words due to space character usage (it combines "country is"
as one selection) on the client and server can do a better job.

+     * amount moves the selection towards the end of the document.
+     * @param startAdjust The amount to adjust the start of the selection.
+     * @param endAdjust The amount to adjust the end of the selection.
+     */
+    public void expandSelectionByCharacterOffset(int startAdjust, int endAdjust);
+
+    /**
      * Get the URL of the current page.
      *
      * @return The URL of the current page.