Upstream android file related code.

base/shared_memory.h

Index: base/shared_memory.h
diff --git a/base/shared_memory.h b/base/shared_memory.h
index cf07da326dad3885c91a27edc884ed87144f0c74..74e14aa68f7e183021ebb31c7a5cc432395c0e01 100644
--- a/base/shared_memory.h
+++ b/base/shared_memory.h
@@ -184,6 +184,11 @@ class BASE_API SharedMemory {
   // Releases the shared memory lock.
   void Unlock();
 
+#if defined(OS_ANDROID)
+  // Returns the size of shared memory or a negative value on error.
+  int GetAshmenSizeRegion();

[darin (slow to review), 2011/06/20 18:44:01]

Is "Asmen" a common word on Android?  It is good to use function names
consisting of words and common acronyms.  OK, I see... the underlying API is
prefixed by ashmen_.

Can you tell me why you need this Android-specific public method?  Are you sure
there isn't a portable method to be defined here?

Note: The comment on created_size().  It says that the caller should know the
size.

[michaelbai, 2011/06/20 22:50:36]

I think created_size() is just for one who created the shmem. This method is for
the one who open it. Joth point out http://crbug.com/60821 in previous comment

+#endif
+
  private:
 #if defined(OS_POSIX)
   bool PrepareMapFile(FILE *fp);