Code Drop Three (Update Two)

In this update we have:

  - Added the verified platform tests. These tests show how some
    platforms, when verified are allowed to by pass the normal policy
    restrictions. This is done with ChromeOS, thus the name of the
    tests use "chrome_os".

  - Removed WB_RESULT_INVALID_PADDING. This error was when we the
    non-license APIs exposed a AES function with padding. However,
    those functions have been removed from the API and this error is
    no longer used by the API.

  - Tests have been updated to avoid signed-vs-unsigned comparison
    and to use the Chromium path to gTest (which is mocked in this
    library).

  - Tests have been updated to use a new test base and golden data
    system to make them easier to read.

api/license_whitebox_sign_license_request_test.cc

@@ -6,11 +6,11 @@
 #include <string>
 #include <vector>
 
-#include "api/license_builder.h"
 #include "api/license_whitebox_test_base.h"
 #include "api/test_data.h"
+#include "api/test_license_builder.h"
 #include "crypto_utils/rsa_key.h"
-#include "testing/include/gtest/gtest.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 namespace widevine {
 
@@ -19,7 +19,7 @@ class LicenseWhiteboxSignLicenseRequestTest : public LicenseWhiteboxTestBase {
   void SetUp() override {
     LicenseWhiteboxTestBase::SetUp();
 
-    LicenseBuilder builder;
+    TestLicenseBuilder builder;
     builder.Build(*public_key_, &license_);
 
     // We must make the default size large to hold the signature returned by
@@ -123,6 +123,6 @@ TEST_F(LicenseWhiteboxSignLicenseRequestTest, BufferTooSmall) {
   // When WB_RESULT_BUFFER_TOO_SMALL is returned, the required buffer size
   // should be returned via |signature_size|. Since we don't know what it is, we
   // must rely on it being larger than the original "too small" size.
-  ASSERT_GT(signature_size_, 1);
+  ASSERT_GT(signature_size_, 1u);
 }
 }  // namespace widevine