Fixup mojo dylibs to support mojo in content

content/content_shell.gypi

Index: content/content_shell.gypi
diff --git a/content/content_shell.gypi b/content/content_shell.gypi
index 1a132fdb99e861dbed1e6ead22a7d9ff2e684cdf..b79e085352fe5701ce73cf7ecc968eada62e7a08 100644
--- a/content/content_shell.gypi
+++ b/content/content_shell.gypi
@@ -849,10 +849,39 @@
                          '--version=<(content_shell_version)',
                          '--branding=<(content_shell_product_name)'],
             },
+            {
+              # Copy libmojo_system.dylib explicitly. The copies section does a
+              # hard link, and since we modify it we would end up with the wrong
+              # load command in things linked afterward.
+              'postbuild_name': 'Copy libmojo_system.dylib',
+              'action': ['cp',
+                         '-p',
+                         '${BUILT_PRODUCTS_DIR}/libmojo_system.dylib',
+                         '${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}/Libraries'],
+            },
+            {
+              # Changes the id of libmojo_system.dylib to come from the
+              # Libraries folder to be consistent with the load command.
+              'postbuild_name': 'Update id of libmojo_system.dylib',
+              'action': ['install_name_tool',
+                         '-id',
+                         '@loader_path/Libraries/libmojo_system.dylib',
+                         '${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}/Libraries/libmojo_system.dylib'],
+            },
+            {
+              # Changes the load command of libmojo_system.dylib to come from
+              # the Libraries folder.
+              'postbuild_name': 'Update load of libmojo_system.dylib',
+              'action': ['install_name_tool',
+                         '-change',
+                         '@loader_path/libmojo_system.dylib',
+                         '@loader_path/Libraries/libmojo_system.dylib',
+                         '${BUILT_PRODUCTS_DIR}/${EXECUTABLE_PATH}'],
+            },
           ],
           'copies': [
             {
-              # Copy FFmpeg binaries for audio/video support.
+              # Copy FFmpeg for audio/video support and mojo.
               'destination': '<(PRODUCT_DIR)/$(CONTENTS_FOLDER_PATH)/Libraries',
               'files': [
                 '<(PRODUCT_DIR)/ffmpegsumo.so',