Breakpad symbol dumper: Promise that Module::SetLoadAddress can be called at any time.

It's possible to imagine an implementation of google_breakpad::Module in
which calling SetLoadAddress at different times as the Module is populated
would produce different output. For the Mac dumper, we'd like to depend on
its current behavior --- that the load address is subtracted off only when
writing the symbol file, and can be set at any time prior to that.

This patch makes that promise part of Module's contract, and adjusts the
test suite to verify that that promise is met.

a=jimblandy, r=thestig


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@588 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/common/module_unittest.cc

@@ -140,8 +140,6 @@ TEST(Write, RelativeLoadAddress) {
   FILE *f = checked_tmpfile();
   Module m(MODULE_NAME, MODULE_OS, MODULE_ARCH, MODULE_ID);
 
-  m.SetLoadAddress(0x2ab698b0b6407073LL);
-
   // Some source files.  We will expect to see them in lexicographic order.
   Module::File *file1 = m.FindFile("filename-b.cc");
   Module::File *file2 = m.FindFile("filename-a.cc");
@@ -174,6 +172,10 @@ TEST(Write, RelativeLoadAddress) {
   entry->rule_changes[0x30f9e5c83323973eULL]["Mister"] = "Death";
   m.AddStackFrameEntry(entry);
 
+  // Set the load address.  Doing this after adding all the data to
+  // the module must work fine.
+  m.SetLoadAddress(0x2ab698b0b6407073LL);
+
   m.Write(f);
   checked_fflush(f);
   rewind(f);