Bug 1486502 - Add widevine CDM headers to third party paths, clang-format ignore. r=sylvestre

We wish to keep the widevine headers in the same formatting as upstream to
ease comparison and as we do not modify these files. This patch adds the
existing headers, as well as another we anticipate pulling down for our next
bump (content_decryption_module_proxy.h) to the ignored paths. These files are
ignored individually rather than the whole directory they're in, as we also
have Mozilla code in that dir.

Differential Revision: https://phabricator.services.mozilla.com/D4347

--HG--
extra : moz-landing-system : lando

.clang-format-ignore

@@ -35,6 +35,10 @@ browser/extensions/mortar/ppapi/.*
 db/sqlite3/src/.*
 devtools/client/sourceeditor/codemirror/.*
 devtools/client/sourceeditor/tern/.*
+dom/media/gmp/widevine-adapter/content_decryption_module.h
+dom/media/gmp/widevine-adapter/content_decryption_module_export.h
+dom/media/gmp/widevine-adapter/content_decryption_module_ext.h
+dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h
 editor/libeditor/tests/browserscope/lib/richtext/.*
 editor/libeditor/tests/browserscope/lib/richtext2/.*
 extensions/spellcheck/hunspell/src/.*

tools/rewriting/ThirdPartyPaths.txt

@@ -5,6 +5,10 @@ devtools/client/sourceeditor/codemirror/
 devtools/client/sourceeditor/tern/
 devtools/shared/heapsnapshot/CoreDump.pb.cc
 devtools/shared/heapsnapshot/CoreDump.pb.h
+dom/media/gmp/widevine-adapter/content_decryption_module.h
+dom/media/gmp/widevine-adapter/content_decryption_module_export.h
+dom/media/gmp/widevine-adapter/content_decryption_module_ext.h
+dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h
 editor/libeditor/tests/browserscope/lib/richtext/
 editor/libeditor/tests/browserscope/lib/richtext2/
 extensions/spellcheck/hunspell/src/