Add Equals() to mojom structs and related types.

mojo/public/cpp/bindings/array.h

Index: mojo/public/cpp/bindings/array.h
diff --git a/mojo/public/cpp/bindings/array.h b/mojo/public/cpp/bindings/array.h
index 966cf313d1cbd2afd2f8013d7fd91b7cca9c284b..2544abb04dadf76c001a0d186c8d6d7e79de5af9 100644
--- a/mojo/public/cpp/bindings/array.h
+++ b/mojo/public/cpp/bindings/array.h
@@ -12,6 +12,7 @@
 #include <vector>
 
 #include "mojo/public/cpp/bindings/lib/array_internal.h"
+#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
 #include "mojo/public/cpp/bindings/lib/template_util.h"
 #include "mojo/public/cpp/bindings/type_converter.h"
 
@@ -107,6 +108,18 @@ class Array {
     return result.Pass();
   }
 
+  bool Equals(const Array& other) const {
+    if (is_null() != other.is_null())
+      return false;
+    if (size() != other.size())
+      return false;
+    for (size_t i = 0; i < size(); ++i) {
+      if (!internal::ValueTraits<T>::Equals(at(i), other.at(i)))
+        return false;
+    }
+    return true;
+  }
+
  private:
   typedef std::vector<StorageType> Array::*Testable;