Proof of concept implementation of context based history filtering.

chrome/browser/resources/history/history.js

Index: chrome/browser/resources/history/history.js
diff --git a/chrome/browser/resources/history/history.js b/chrome/browser/resources/history/history.js
index 8cfb2f8174496419691e2fe238fa70be527a07af..707ca5ea5bb1328d669dc9da5acedfe1610f4136 100644
--- a/chrome/browser/resources/history/history.js
+++ b/chrome/browser/resources/history/history.js
@@ -128,6 +128,7 @@ function Visit(result, continued, model) {
   this.url_ = result.url;
   this.domain_ = result.domain;
   this.starred_ = result.starred;
+  this.context_ = result.context;
 
   // These identify the name and type of the device on which this visit
   // occurred. They will be empty if the visit occurred on the current device.
@@ -858,8 +859,9 @@ HistoryModel.prototype.queryHistory_ = function() {
 
   $('loading-spinner').hidden = false;
   this.inFlight_ = true;
+  this.context = $('context-chooser').selectedIndex;
   chrome.send('queryHistory',
-      [this.searchText_, this.offset_, this.rangeInDays_, endTime, maxResults]);
+      [this.searchText_, this.offset_, this.rangeInDays_, endTime, this.context, maxResults]);
 };
 
 /**
@@ -1008,6 +1010,7 @@ function HistoryView(model) {
 
   $('clear-browsing-data').addEventListener('click', openClearBrowsingData);
   $('remove-selected').addEventListener('click', removeItems);
+  $('context-chooser').addEventListener('change', onChange);
 
   // Add handlers for the page navigation buttons at the bottom.
   $('newest-button').addEventListener('click', function() {
@@ -2147,6 +2150,10 @@ function confirmDeletion(okCallback, cancelCallback) {
   showConfirmationOverlay();
 }
 
+function onChange() {
+    historyModel.reload();
+}
+
 /**
  * Click handler for the 'Remove selected items' button.
  * Confirms the deletion with the user, and then deletes the selected visits.