Add a "Keepalive count" column to Task Manager.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 1616a15d07bda768aa431770b865810edded6c52..526fec637a8e8e355f765a94b71569de4300e14a 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -3394,6 +3394,9 @@ From <ph name="DOWNLOAD_DOMAIN">$3<ex>example.com</ex></ph>
           <message name="IDS_TASK_MANAGER_MEMORY_STATE_COLUMN" desc="Task manager memory state column.  Shows the memory coordinator's state of a process">
             Memory state
           </message>
+          <message name="IDS_TASK_MANAGER_KEEPALIVE_COUNT_COLUMN" desc="Task manager keepalive count column.  Specific to Chrome extension processes, and only to those which use 'lazy' event pages, this indicates how many activities are making use of the extension, and therefore causing it to be kept alive.">
+            Keepalive count
+          </message>
         </if>
         <if expr="use_titlecase">
           <message name="IDS_TASK_MANAGER_KILL" desc="The caption of the Task Manager kill button">
@@ -3471,6 +3474,9 @@ From <ph name="DOWNLOAD_DOMAIN">$3<ex>example.com</ex></ph>
           <message name="IDS_TASK_MANAGER_MEMORY_STATE_COLUMN" desc="Task manager memory state column.  Shows the memory coordinator's state of a process">
             Memory State
           </message>
+          <message name="IDS_TASK_MANAGER_KEEPALIVE_COUNT_COLUMN" desc="Task manager keepalive count column.  Specific to Chrome extension processes, and only to those which use 'lazy' event pages, this indicates how many activities are making use of the extension, and therefore causing it to be kept alive.">
+            Keepalive Count
+          </message>
         </if>
         <message name="IDS_TASK_MANAGER_MEM_CELL_TEXT" desc="The value displayed in the memory usage cells.">
           <ph name="NUM_KILOBYTES">$1<ex>5,000</ex></ph>K