Include Mac media glue code in iOS builds.

BUG=410527
R=rsesek, DaleCurtis

Review URL: https://codereview.chromium.org/533423002

Cr-Commit-Position: refs/heads/master@{#293782}

media/BUILD.gn

@@ -340,6 +340,12 @@ component("media") {
     ]
   }
 
+  if (is_ios) {
+    deps += [
+      "//media/base/mac",
+    ]
+  }
+
   if (is_win) {
     libs += [
       "mf.lib",

media/media.gyp

@@ -988,7 +988,19 @@
             'base/keyboard_event_counter.h',
           ],
         }],
-      ],
+      ],  # conditions
+      'target_conditions': [
+        ['OS == "ios" and _toolset != "host"', {
+          'sources/': [
+            # Pull in specific Mac files for iOS (which have been filtered out
+            # by file name rules).
+            ['include', '^base/mac/avfoundation_glue\\.h$'],
+            ['include', '^base/mac/avfoundation_glue\\.mm$'],
+            ['include', '^base/mac/coremedia_glue\\.h$'],
+            ['include', '^base/mac/coremedia_glue\\.mm$'],
+          ],
+        }],
+      ],  # target_conditions
     },
     {
       # GN version: //media/mojo/interfaces