Add key modifier on minimize/restore button click to minimize/restore all Panels for Mac.

chrome/app/nibs/Panel.xib

Index: chrome/app/nibs/Panel.xib
diff --git a/chrome/app/nibs/Panel.xib b/chrome/app/nibs/Panel.xib
index 112f9c136e30869301d68a179795cf1e013c14bb..bfc470c7b98cf5b4d7727f8046af4ae8526ea800 100644
--- a/chrome/app/nibs/Panel.xib
+++ b/chrome/app/nibs/Panel.xib
@@ -12,8 +12,8 @@
 		</object>
 		<object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
 			<bool key="EncodedWithXMLCoder">YES</bool>
-			<integer value="1"/>
 			<integer value="6"/>
+			<integer value="1"/>
 		</object>
 		<object class="NSArray" key="IBDocument.PluginDependencies">
 			<bool key="EncodedWithXMLCoder">YES</bool>
@@ -74,7 +74,6 @@
 						<int key="NSvFlags">301</int>
 						<string key="NSFrameSize">{14, 16}</string>
 						<reference key="NSSuperview" ref="304499912"/>
-						<bool key="NSViewIsLayerTreeHost">YES</bool>
 						<int key="NSViewLayerContentsRedrawPolicy">2</int>
 						<bool key="NSEnabled">YES</bool>
 						<object class="NSButtonCell" key="NSCell" id="107796922">
@@ -100,7 +99,6 @@
 						<int key="NSvFlags">301</int>
 						<string key="NSFrameSize">{14, 16}</string>
 						<reference key="NSSuperview" ref="304499912"/>
-						<bool key="NSViewIsLayerTreeHost">YES</bool>
 						<int key="NSViewLayerContentsRedrawPolicy">2</int>
 						<bool key="NSEnabled">YES</bool>
 						<object class="NSButtonCell" key="NSCell" id="507246925">