Make SkSHA1 and SkM5 use common SkDigestHash result type

tests/SHA1Test.cpp

Index: tests/SHA1Test.cpp
===================================================================
--- tests/SHA1Test.cpp	(revision 8685)
+++ tests/SHA1Test.cpp	(working copy)
@@ -7,19 +7,14 @@
 #include "Test.h"
 #include "SkSHA1.h"
 
-static bool digests_equal(const SkSHA1::Digest& expectedDigest, const SkSHA1::Digest& computedDigest) {
-    for (size_t i = 0; i < SK_ARRAY_COUNT(expectedDigest.data); ++i) {
-        if (expectedDigest.data[i] != computedDigest.data[i]) {
-            return false;
-        }
-    }
-    return true;
-}
+struct SHA1Digest {
+    uint8_t data[20];
+};
 
 static struct SHA1Test {
     const char* message;
     const unsigned long int repeatCount;
-    const SkSHA1::Digest digest;
+    const SHA1Digest digestBytes;
 } sha1_tests[] = {
     // Reference tests from RFC3174 Section 7.3 ( http://www.ietf.org/rfc/rfc3174.txt )
     { "abc", 1, {{ 0xA9, 0x99, 0x3E, 0x36, 0x47, 0x06, 0x81, 0x6A, 0xBA, 0x3E, 0x25, 0x71, 0x78, 0x50, 0xC2, 0x6C, 0x9C, 0xD0, 0xD8, 0x9D }} },
@@ -39,10 +34,11 @@
     for (unsigned long int i = 0; i < test.repeatCount; ++i) {
         context.update(reinterpret_cast<const uint8_t*>(test.message), len);
     }
-    SkSHA1::Digest digest;
-    context.finish(digest);
+    SkHashDigest actualDigest;
+    context.finish(actualDigest);
 
-    REPORTER_ASSERT(reporter, digests_equal(test.digest, digest));
+    SkHashDigest expectedDigest(test.digestBytes.data, sizeof(test.digestBytes.data));
+    REPORTER_ASSERT(reporter, expectedDigest.equals(actualDigest));
 }
 
 static void TestSHA1(skiatest::Reporter* reporter) {