Add chrome_split_dll gyp variable, and duplicate chrome_main_dll target

content/content.gyp

Index: content/content.gyp
diff --git a/content/content.gyp b/content/content.gyp
index f7902796b29e3a0f3ae0477f60b289d28e7308ce..ef4a0873fabaff5d728368cb9220f9c6a9d0d080 100644
--- a/content/content.gyp
+++ b/content/content.gyp
@@ -64,7 +64,7 @@
             'content_common',
           ],
           'conditions': [
-            ['OS != "ios"', {
+            ['OS != "ios" and chrome_split_dll != 1', {
               'dependencies': [
                 'content_gpu',
                 'content_plugin',
@@ -99,12 +99,17 @@
             'content_resources.gyp:content_resources',
           ],
           'conditions': [
-            ['OS != "ios"', {
+            ['OS != "ios" and chrome_split_dll != 1', {
               'dependencies': [
                 'content_gpu',
                 'content_renderer',
               ],
             }],
+            ['chrome_split_dll', {
+              'dependencies': [
+                'content_gpu',
+              ],
+            }],
           ],
         },
         {