Document diffy logo is CC-BY 3.0

Restructure the build process slightly so there is license information
attached to the diffy images.  The CC-BY 3.0 attribution information
and license will now appear in the documentation alongside all other
libraries used by Gerrit.

Change-Id: I8e3315fbe79ae1dc8e0444c6e6ed2ae241bcefb0

gerrit-gwtui/BUCK

@@ -53,12 +53,15 @@ gwt_user_agent_permutations(
   visibility = ['//:'],
 )
 
+DIFFY = glob(['src/main/java/com/google/gerrit/client/diffy*.png'])
+
 gwt_module(
   name = 'ui_module',
   srcs = glob(['src/main/java/**/*.java']),
   gwtxml = 'src/main/java/%s.gwt.xml' % MODULE.replace('.', '/'),
-  resources = glob(['src/main/java/**/*']),
+  resources = glob(['src/main/java/**/*'], excludes = DIFFY),
   deps = [
+    ':diffy_logo',
     '//gerrit-gwtexpui:Clippy',
     '//gerrit-gwtexpui:CSS',
     '//gerrit-gwtexpui:GlobalKey',
@@ -84,6 +87,28 @@ gwt_module(
   ],
 )
 
+prebuilt_jar(
+  name = 'diffy_logo',
+  binary_jar = genfile('diffy_images.jar'),
+  deps = [
+    '//lib:LICENSE-diffy',
+    '//lib:LICENSE-CC-BY3.0',
+    ':diffy_image_files_ln',
+  ],
+)
+
+genrule(
+  name = 'diffy_image_files_ln',
+  cmd = 'ln -s $(location :diffy_image_files) $OUT',
+  deps = [':diffy_image_files'],
+  out = 'diffy_images.jar',
+)
+
+java_library(
+  name = 'diffy_image_files',
+  resources = DIFFY,
+)
+
 java_test(
   name = 'ui_tests',
   srcs = glob(['src/test/java/**/*.java']),

lib/BUCK

@@ -2,6 +2,7 @@ include_defs('//lib/maven.defs')
 
 define_license(name = 'Apache1.1')
 define_license(name = 'Apache2.0')
+define_license(name = 'CC-BY3.0')
 define_license(name = 'MPL1.1')
 define_license(name = 'PublicDomain')
 define_license(name = 'antlr')
@@ -10,6 +11,7 @@ define_license(name = 'automaton')
 define_license(name = 'bouncycastle')
 define_license(name = 'clippy')
 define_license(name = 'codemirror')
+define_license(name = 'diffy')
 define_license(name = 'h2')
 define_license(name = 'jgit')
 define_license(name = 'jsch')

lib/LICENSE-CC-BY3.0

@@ -0,0 +1,333 @@
+link:http://creativecommons.org/licenses/by/3.0/us/[CC-BY 3.0]
+
+THE WORK (AS DEFINED BELOW) IS PROVIDED UNDER THE TERMS OF THIS
+CREATIVE COMMONS PUBLIC LICENSE ("CCPL" OR "LICENSE").  THE WORK IS
+PROTECTED BY COPYRIGHT AND/OR OTHER APPLICABLE LAW.  ANY USE OF THE
+WORK OTHER THAN AS AUTHORIZED UNDER THIS LICENSE OR COPYRIGHT LAW IS
+PROHIBITED.
+
+BY EXERCISING ANY RIGHTS TO THE WORK PROVIDED HERE, YOU ACCEPT AND
+AGREE TO BE BOUND BY THE TERMS OF THIS LICENSE.  TO THE EXTENT THIS
+LICENSE MAY BE CONSIDERED TO BE A CONTRACT, THE LICENSOR GRANTS YOU
+THE RIGHTS CONTAINED HERE IN CONSIDERATION OF YOUR ACCEPTANCE OF SUCH
+TERMS AND CONDITIONS.
+
+1.  Definitions
+
+  a.  "Adaptation" means a work based upon the Work, or upon the Work
+      and other pre-existing works, such as a translation, adaptation,
+      derivative work, arrangement of music or other alterations of a
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lib/LICENSE-diffy

@@ -0,0 +1 @@
+link:http://creativecommons.org/licenses/by/3.0/us/[CC-BY 3.0] (c) Sara Owens, inkylabs.com