Update content and media unittest isolate targets.

media/media_unittests.isolate

Index: media/media_unittests.isolate
diff --git a/media/media_unittests.isolate b/media/media_unittests.isolate
index 0aa38c0eb6010194fc310c502892e2ebd23d44b1..d713eb088dd836862d7255bc6d0292ca9567dba8 100644
--- a/media/media_unittests.isolate
+++ b/media/media_unittests.isolate
@@ -2,13 +2,34 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
+  'includes': [
+    '../base/base.isolate',
+  ],
   'conditions': [
-    ['OS=="android"', {
+    ['OS=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'isolate_dependency_untracked': [
           'test/data/',
         ],
       },
     }],
+    ['OS=="linux" or OS=="mac" or OS=="win"', {
+      'variables': {
+        'command': [
+          '<(PRODUCT_DIR)/media_unittests<(EXECUTABLE_SUFFIX)',
+        ],
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/media_unittests<(EXECUTABLE_SUFFIX)',
+        ],
+      },
+    }],
+    # TODO(jmadill): should be automatic. http://crbug.com/418146

[Ken Russell (switch to Gerrit), 2014/09/26 21:03:42]

Not sure this is automatically included yet. Per comment on Issue 418146 I think
it's necessary to copy the Linux and Mac sections for this dependency.

+    ['OS=="win"', {
+      'variables': {
+        'isolate_dependency_tracked': [
+          '<(PRODUCT_DIR)/ffmpegsumo.dll',
+        ],
+      },
+    }],
   ],
 }