Add chrome_split_dll gyp variable, and duplicate chrome_main_dll target (reland)

chrome/chrome.gyp

Index: chrome/chrome.gyp
diff --git a/chrome/chrome.gyp b/chrome/chrome.gyp
index 4b520a839c57688dc9c1e0fdcadd2cd0ba89440a..7487ae09596f517f469ed445c1890f0d87d07b2a 100644
--- a/chrome/chrome.gyp
+++ b/chrome/chrome.gyp
@@ -10,12 +10,17 @@
     # the link of the actual chrome (or chromium) executable on
     # Linux or Mac, and into chrome.dll on Windows.
     # NOTE: Most new includes should go in the OS!="ios" condition below.
-    'chromium_dependencies': [
+    'chromium_browser_dependencies': [
       'common',
       'browser',
       '../content/content.gyp:content_app',
       '../sync/sync.gyp:sync',
     ],
+    'chromium_child_dependencies': [
+      'common',
+      '../content/content.gyp:content_app',
+      '../sync/sync.gyp:sync',
+    ],
     'allocator_target': '../base/allocator/allocator.gyp:allocator',
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
     'protoc_out_dir': '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
@@ -24,7 +29,12 @@
     'apply_locales_cmd': ['python', '<(DEPTH)/build/apply_locales.py'],
     'conditions': [
       ['OS!="ios"', {
-        'chromium_dependencies': [
+        'chromium_browser_dependencies': [
+          'debugger',
+          '../content/content.gyp:content_ppapi_plugin',
+          '../printing/printing.gyp:printing',
+        ],
+        'chromium_child_dependencies': [
           'debugger',
           'plugin',
           'renderer',
@@ -46,7 +56,7 @@
             'app/resources/locale_settings_win.grd',
       },],
       ['OS!="android" and OS!="ios"', {
-        'chromium_dependencies': [
+        'chromium_browser_dependencies': [
           # Android doesn't use the service process (only needed for print).
           'service',
         ],