Implement BreakDebugger for ARM.

Review URL: http://codereview.chromium.org/115087


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15548 0039d316-1c4b-4281-b951-d872f2087c98

base/debug_util_posix.cc

@@ -108,8 +108,10 @@ bool DebugUtil::BeingDebugged() {
 
 // static
 void DebugUtil::BreakDebugger() {
-#if !defined(ARCH_CPU_ARM_FAMILY)
-  asm ("int3");
+#if defined(ARCH_CPU_ARM_FAMILY)
+  asm("bkpt 0");
+#else
+  asm("int3");
 #endif
 }