Modify fileAtPath stat to track if the call was redirected by chrome_elf.

chrome_elf/chrome_elf.gyp

Index: chrome_elf/chrome_elf.gyp
diff --git a/chrome_elf/chrome_elf.gyp b/chrome_elf/chrome_elf.gyp
index 00cee29a1612e6b011fb720eb643cda854c273e8..fa6ed36f773d4903c83fd091132e94b88170b0fc 100644
--- a/chrome_elf/chrome_elf.gyp
+++ b/chrome_elf/chrome_elf.gyp
@@ -40,6 +40,15 @@
           ],
         },
       },
+      'conditions': [
+        ['component=="shared_library"', {
+          # In component builds, all targets depend on chrome_redirects by
+          # default. Remove it here to avoid a circular dependency.
+          'dependencies!': [
+            '../chrome_elf/chrome_elf.gyp:chrome_redirects',
+          ],
+        }],
+      ],
     },
     {
       'target_name': 'chrome_elf_unittests_exe',
@@ -168,6 +177,7 @@
           ],
           'sources': [
             'chrome_redirects.def',
+            'chrome_redirects_main.cc',
           ],
           'dependencies': [
             'chrome_elf_lib',