Make Linux packaging options more granular.

This allows us to not waste time building packages/channels we don't care about. Also added option to build new 'trunk' channel packages, which are a special configuration for developer testing.

Review URL: http://codereview.chromium.org/418021


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@32879 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/common.gypi b/build/common.gypi
index 612874c..7f3bc59e 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -85,6 +85,11 @@
     'inside_chromium_build%': '<(inside_chromium_build)',
     'fastbuild%': '<(fastbuild)',
 
+    # The release channel that this build targets. This is used to restrict
+    # channel-specific build options, like which installer packages to create.
+    # The default is 'all', which does no channel-specific filtering.
+    'channel%': 'all',
+
     # Override chromium_mac_pch and set it to 0 to suppress the use of
     # precompiled headers on the Mac.  Prefix header injection may still be
     # used, but prefix headers will not be precompiled.  This is useful when