Factor out content shell and tests into a standalone gyp

content/content_tests.gypi

Index: content/content_tests.gypi
diff --git a/content/content_tests.gypi b/content/content_tests.gypi
index 751ffa010833f928e6eb23d43bfe29144c3c84af..f3cfd712f02b248958b5f1e595ded44f9e57bcdf 100644
--- a/content/content_tests.gypi
+++ b/content/content_tests.gypi
@@ -739,8 +739,8 @@
             'content_gpu',
             'content_plugin',
             'content_renderer',
-            'content_shell_lib',
-            'content_shell_pak',
+            'content_shell.gyp:content_shell_lib',
+            'content_shell.gyp:content_shell_pak',
             'test_support_content',
             '../base/base.gyp:test_support_base',
             '../gpu/gpu.gyp:gpu',
@@ -926,14 +926,14 @@
                 'shell/android/browsertests_apk/content_browser_tests_android.cc',
               ],
               'dependencies': [
-                'content_shell_jni_headers',
-                'content_shell_lib',
+                'content_shell.gyp:content_shell_jni_headers',
+                'content_shell.gyp:content_shell_lib',
                 '../testing/android/native_test.gyp:native_test_util',
               ],
             }],
             ['OS=="mac"', {
               'dependencies': [
-                'content_shell',  # Needed for Content Shell.app's Helper.
+                'content_shell.gyp:content_shell',  # Needed for Content Shell.app's Helper.
               ],
               'sources': [
                 'renderer/external_popup_menu_browsertest.cc',
@@ -1139,7 +1139,7 @@
             'content_browsertests',
             'content_java',
             'content_java_test_support',
-            'content_shell_java',
+            'content_shell.gyp:content_shell_java',
           ],
           'variables': {
             'apk_name': 'content_browsertests',
@@ -1203,7 +1203,7 @@
           'dependencies': [
             'content_java',
             'content_java_test_support',
-            'content_shell_apk_java',
+            'content_shell.gyp:content_shell_apk_java',
             '../base/base.gyp:base_java',
             '../base/base.gyp:base_javatests',
             '../base/base.gyp:base_java_test_support',