Fix Android build.

This patch fixes the Android build, and updates the NDK test
application to use the new Linux ExceptionHandler API.

+ Use string insted of std::string in minidump_descriptor.h
Review URL: https://breakpad.appspot.com/433002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1016 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/client/linux/handler/exception_handler.cc

@@ -326,11 +326,16 @@ bool ExceptionHandler::HandleSignal(int sig, siginfo_t* info, void* uc) {
 // This is a public interface to HandleSignal that allows the client to
 // generate a crash dump. This function may run in a compromised context.
 bool ExceptionHandler::SimulateSignalDelivery(int sig) {
+#ifdef __ANDROID__
+  // Android doesn't provide getcontext().
+  return false;
+#else
   siginfo_t siginfo;
   my_memset(&siginfo, 0, sizeof(siginfo_t));
   struct ucontext context;
   getcontext(&context);
   return HandleSignal(sig, &siginfo, &context);
+#endif
 }
 
 // This function may run in a compromised context: see the top of the file.