Allow plugins to participate in Chrome context menus.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 114593)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -443,7 +443,23 @@
           Show &Controls
         </message>
 
-        <message name="IDS_CONTENT_CONTEXT_SAVEVIDEOAS" desc="The name of the Save Video As command in the content area context menu">
+		<message name="IDS_CONTENT_CONTEXT_FITPAGEWIDTH" desc="Xxx content area context menu">
+		  Fit &amp;Width
+		</message>
+		<message name="IDS_CONTENT_CONTEXT_FITPAGEHEIGHT" desc="Xxx content area context menu">
+		  Fit &amp;Height
+		</message>
+		<message name="IDS_CONTENT_CONTEXT_FITPAGE" desc="Xxx content area context menu">
+		  Fit &amp;Page
+		</message>
+		<message name="IDS_CONTENT_CONTEXT_ROTATEPAGECW" desc="Xxx content area context menu">
+		  Rotate &amp;Clockwise
+		</message>
+		<message name="IDS_CONTENT_CONTEXT_ROTATEPAGECCW" desc="Xxx content area context menu">
+		  Rotate &amp;Counter-clockwise
+		</message>
+
+		<message name="IDS_CONTENT_CONTEXT_SAVEVIDEOAS" desc="The name of the Save Video As command in the content area context menu">
           Sa&amp;ve video as...
         </message>
         <message name="IDS_CONTENT_CONTEXT_COPYVIDEOLOCATION" desc="The name of the Copy Video Location command in the content area context menu">