Add some more logging to help diagnise component update issues.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

Index: chrome/browser/component_updater/widevine_cdm_component_installer.cc
diff --git a/chrome/browser/component_updater/widevine_cdm_component_installer.cc b/chrome/browser/component_updater/widevine_cdm_component_installer.cc
index 68c6d589cd267ddb0b29d9ecfc3c07431cc4d6f3..8f74a949b0fdc85ceb9c1a9dd78864c9b2e2f250 100644
--- a/chrome/browser/component_updater/widevine_cdm_component_installer.cc
+++ b/chrome/browser/component_updater/widevine_cdm_component_installer.cc
@@ -280,7 +280,7 @@ void WidevineCdmComponentInstallerTraits::ComponentReady(
     const base::FilePath& path,
     scoped_ptr<base::DictionaryValue> manifest) {
   if (!IsCompatibleWithChrome(*manifest)) {
-    DLOG(WARNING) << "Installed Widevine CDM component is incompatible.";
+    VLOG(1) << "Installed Widevine CDM component is incompatible.";
     return;
   }
 
@@ -328,6 +328,10 @@ void WidevineCdmComponentInstallerTraits::UpdateCdmAdapter(
       GetPlatformDirectory(cdm_install_dir)
           .AppendASCII(kWidevineCdmAdapterFileName);
 
+  VLOG(1) << "UpdateCdmAdapter: version" << cdm_version.GetString()
+          << " adapter_install_path=" << adapter_install_path.AsUTF8Unsafe()
+          << " adapter_version_path=" << adapter_version_path.AsUTF8Unsafe();
+
   const std::string chrome_version = version_info::GetVersionNumber();
   DCHECK(!chrome_version.empty());
   std::string adapter_version;
@@ -338,14 +342,14 @@ void WidevineCdmComponentInstallerTraits::UpdateCdmAdapter(
         adapter_version_path, chrome_version.data(), chrome_version.size());
     if (bytes_written < 0 ||
         static_cast<size_t>(bytes_written) != chrome_version.size()) {
-      DLOG(WARNING) << "Failed to write Widevine CDM adapter version file.";
+      PLOG(WARNING) << "Failed to write Widevine CDM adapter version file.";
       // Ignore version file writing failure and try to copy the CDM adapter.
     }
 
     base::FilePath adapter_source_path;
     PathService::Get(chrome::FILE_WIDEVINE_CDM_ADAPTER, &adapter_source_path);
     if (!base::CopyFile(adapter_source_path, adapter_install_path)) {
-      DLOG(WARNING) << "Failed to copy Widevine CDM adapter.";
+      PLOG(WARNING) << "Failed to copy Widevine CDM adapter.";
       return;
     }
   }