Remember zoom on a per-host basis.

BUG=567
TEST=Visit a page, zoom in or out, then navigate to a different host.  The new page should not be zoomed.  Go back, or restart, or open a new tab and navigate to the old page, and it should be zoomed.
Review URL: http://codereview.chromium.org/437077

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@33886 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index c34bc49..7c403d6 100755
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -969,6 +969,8 @@
         'browser/history/visit_tracker.h',
         'browser/history/visitsegment_database.cc',
         'browser/history/visitsegment_database.h',
+        'browser/host_zoom_map.cc',
+        'browser/host_zoom_map.h',
         'browser/hung_renderer_dialog.h',
         'browser/icon_loader.h',
         'browser/icon_loader.cc',