Add PPAPI decryptor implementation.

webkit/media/webkit_media.gypi

Index: webkit/media/webkit_media.gypi
diff --git a/webkit/media/webkit_media.gypi b/webkit/media/webkit_media.gypi
index d1529910e503549cfa5792c7ab9a339e6eb0edc9..0170f5fea570b26259aac74d8f3a846ba09aad21 100644
--- a/webkit/media/webkit_media.gypi
+++ b/webkit/media/webkit_media.gypi
@@ -83,5 +83,39 @@
         }],
       ],
     },
+    {
+      'target_name': 'ppapi_content_decryptor',
+      'type': 'none',
+      'dependencies': [
+        '<(DEPTH)/ppapi/ppapi.gyp:ppapi_cpp'
+      ],
+      'conditions': [
+        ['os_posix==1 and OS!="mac"', {
+          'cflags': ['-fvisibility=hidden'],
+          'type': 'shared_library',
+          # -gstabs, used in the official builds, causes an ICE. Simply remove
+          # it.
+          'cflags!': ['-gstabs'],
+        }],
+        ['OS=="win"', {
+          'type': 'shared_library',
+        }],
+        ['OS=="mac"', {
+          'type': 'loadable_module',
+          'mac_bundle': 1,
+          'product_extension': 'plugin',
+          'xcode_settings': {
+            'OTHER_LDFLAGS': [
+              # Not to strip important symbols by -Wl,-dead_strip.
+              '-Wl,-exported_symbol,_PPP_GetInterface',
+              '-Wl,-exported_symbol,_PPP_InitializeModule',
+              '-Wl,-exported_symbol,_PPP_ShutdownModule'
+            ]},
+        }],
+      ],
+      'sources': [
+        'crypto/content_decryptor.cc',
+      ],
+    }
   ],
 }