Add copyright headers to remaining gyp files.

gyp/everything.gyp

+# Copyright 2015 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
 # Build EVERYTHING provided by Skia.
 # (Start with the "most" target, and then add targets that we intentionally
 # left out of "most".  See most.gyp for an explanation of which targets are
 # left out of "most".)
 #
 # We used to call this the 'all' target, but in SOME cases that
 # conflicted with an automatically-generated 'all' target.
 # See https://code.google.com/p/skia/issues/detail?id=932
 #
 {
@@ skipping 11 matching lines @@
           'dependencies': [
             'debugger.gyp:debugger',
             'pdfviewer.gyp:pdfviewer',
             #'v8.gyp:SkV8Example',
           ],
         }],
       ],
     },
   ],
 }