[NaCl SDK] .dsc files copy public headers, add ppapi_cpp dev sources

native_client_sdk/src/libraries/ppapi_gles2/library.dsc

 {
-  'TOOLS': ['newlib', 'glibc', 'pnacl', 'linux', 'win'],
+  'TOOLS': ['newlib', 'glibc', 'pnacl', 'linux', 'win', 'mac'],
   'SEARCH' : [
-    '.',
-    '../../../../ppapi/lib/gl/gles2'
+    '../../../../ppapi/lib/gl/gles2',
+    '../../../../ppapi/lib/gl/include/EGL',
+    '../../../../ppapi/lib/gl/include/GLES2',
+    '../../../../ppapi/lib/gl/include/KHR'
   ],
   'TARGETS': [
     {
       'NAME' : 'ppapi_gles2',
       'TYPE' : 'lib',
       'SOURCES' : [
         'gl2ext_ppapi.c',
         'gles2.c'
       ],
     }
   ],
+  'HEADERS': [
+    # ppapi/lib/gl/include/KHR
+    {
+      'FILES': [
+        'khrplatform.h'
+      ],
+      'DEST': 'include/KHR',
+    },
+
+    # ppapi/lib/gl/include/GLES2
+    {
+      'FILES': [
+        'gl2.h',
+        'gl2ext.h',
+        'gl2platform.h',
+      ],
+      'DEST': 'include/GLES2',
+    },
+
+    # ppapi/lib/gl/include/EGL
+    {
+      'FILES': [
+        'egl.h',
+        'eglext.h',
+        'eglplatform.h',
+      ],
+      'DEST': 'include/EGL',
+    },
+
+    # ppapi/lib/gl/gles2
+    {
+      'FILES': [ 'gl2ext_ppapi.h' ],
+      'DEST': 'include/ppapi/gles2',
+    },
+
+    # Create a duplicate copy of this header
+    # TODO(sbc), remove this copy once we find a way to build gl2ext_ppapi.c.
+    {
+      'FILES': [ 'gl2ext_ppapi.h' ],
+      'DEST': 'include/ppapi/lib/gl/gles2',
+    },
+  ],
   'DEST': 'src',
   'NAME': 'ppapi_gles2',
 }