[Chromecast] Log sample rate changes and tweak audio logging output.

chromecast/base/device_capabilities_impl_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromecast/base/device_capabilities_impl.h"
 
 #include <string>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 38 matching lines @@
       SetValidatedValue(key, std::move(init_value));
   }
 
   // Unregisters itself as Validator.
   ~FakeCapabilityManagerSimple() override {
     capabilities()->Unregister(key_, this);
   }
 
   void Validate(const std::string& path,
                 scoped_ptr<base::Value> proposed_value) override {
-    ASSERT_TRUE(path.find(key_) == 0);
+    ASSERT_EQ(path.find(key_), 0ul);
     if (accept_changes_)
       SetValidatedValue(path, std::move(proposed_value));
   }
 
  private:
   const std::string key_;
   const bool accept_changes_;
 };
 
 // Used to test that capabilities/validator can be read and written in
@@ skipping 18 matching lines @@
   }
 
  private:
   const std::string key_;
 };
 
 // Used to test that capabilities/validators can be read and written in
 // OnCapabilitiesChanged() without encountering deadlocks/unexpected behavior.
 class FakeCapabilitiesObserver : public DeviceCapabilities::Observer {
  public:
-  FakeCapabilitiesObserver(DeviceCapabilities* capabilities)
+  explicit FakeCapabilitiesObserver(DeviceCapabilities* capabilities)
       : capabilities_(capabilities), removed_as_observer(false) {
     capabilities_->AddCapabilitiesObserver(this);
   }
 
   ~FakeCapabilitiesObserver() override {
     if (!removed_as_observer)
       capabilities_->RemoveCapabilitiesObserver(this);
   }
 
   // Runs TestBasicOperations().
@@ skipping 470 matching lines @@
   capabilities()->SetCapability(
       "dummy_validate_key", make_scoped_ptr(new base::FundamentalValue(true)));
   base::RunLoop().RunUntilIdle();
 
   // Check that FakeCapabilityManagerComplex::Validate() ran and that behavior
   // was successful
   AssertBasicOperationsSuccessful(capabilities());
 }
 
 }  // namespace chromecast