Log messages regarding why app banners aren't displayed to the console

chrome/browser/android/banners/app_banner_manager_android.h

Index: chrome/browser/android/banners/app_banner_manager_android.h
diff --git a/chrome/browser/android/banners/app_banner_manager_android.h b/chrome/browser/android/banners/app_banner_manager_android.h
index f93a1b782dd30103f7bcf06a3323a37b0dfcd1b3..2782b2111ef4c69cd077099526da84bf982c31a9 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.h
+++ b/chrome/browser/android/banners/app_banner_manager_android.h
@@ -9,6 +9,7 @@
 #include "base/android/jni_weak_ref.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/android/banners/app_banner_data_fetcher_android.h"
+#include "chrome/browser/banners/app_banner_debug_log.h"
 #include "chrome/browser/banners/app_banner_manager.h"
 
 namespace banners {
@@ -58,6 +59,10 @@ class AppBannerManagerAndroid : public AppBannerManager {
                        const GURL& url,
                        const std::string& id) override;
 
+  bool CheckPlatformAndId(const std::string& platform, const std::string& id);
+
+  bool CheckFetcherMatchesContents();
+
   // AppBannerManager on the Java side.
   JavaObjectWeakGlobalRef weak_java_banner_view_manager_;