Add missing files from last commit!

platform/assert.h

Index: platform/assert.h
===================================================================
--- platform/assert.h	(revision 10127)
+++ platform/assert.h	(working copy)
@@ -268,6 +268,29 @@
 
 #define DEBUG_ASSERT(cond)
 
+// The COMPILE_ASSERT macro can be used to verify that a compile time
+// expression is true. For example, you could use it to verify the
+// size of a static array:
+//
+//   COMPILE_ASSERT(ARRAYSIZE(content_type_names) == CONTENT_NUM_TYPES,
+//                  content_type_names_incorrect_size);
+//
+// or to make sure a struct is smaller than a certain size:
+//
+//   COMPILE_ASSERT(sizeof(foo) < 128, foo_too_large);
+//
+// The second argument to the macro is the name of the variable. If
+// the expression is false, most compilers will issue a warning/error
+// containing the name of the variable.
+
+template <bool>
+struct CompileAssert {
+};
+
+#define COMPILE_ASSERT(expr, msg)                       \
+  typedef CompileAssert<(static_cast<bool>(expr))>      \
+  msg[static_cast<bool>(expr) ? 1 : -1]
+
 #endif  // if defined(DEBUG)