Enable AudioDecoder unit tests on Android

media/base/audio_hash.cc

Index: media/base/audio_hash.cc
diff --git a/media/base/audio_hash.cc b/media/base/audio_hash.cc
index d879e5453629ff1f4e08a4b37c1ed71e1d6b9324..7f133dd78ba086bcf0d0109ff89b35610c6b0561 100644
--- a/media/base/audio_hash.cc
+++ b/media/base/audio_hash.cc
@@ -5,6 +5,7 @@
 // MSVC++ requires this to be set before any other includes to get M_PI.
 #define _USE_MATH_DEFINES
 #include <cmath>
+#include <sstream>
 
 #include "media/base/audio_hash.h"
 
@@ -52,4 +53,17 @@ std::string AudioHash::ToString() const {
   return result;
 }
 
+bool AudioHash::IsEquivalent(const std::string& other, double tolerance) const {
+  float other_hash;
+  char comma;
+
+  std::stringstream is(other);
+  for (size_t i = 0; i < arraysize(audio_hash_); ++i) {
+    is >> other_hash >> comma;
+    if (fabs(audio_hash_[i] - other_hash) > tolerance)
+      return false;
+  }
+  return true;
+}
+
 }  // namespace media