Implement app banner info bars on desktop.

chrome/browser/banners/app_banner_manager.cc

Index: chrome/browser/banners/app_banner_manager.cc
diff --git a/chrome/browser/banners/app_banner_manager.cc b/chrome/browser/banners/app_banner_manager.cc
index fdbf80b17677caf4fe6eeca51a5d479730fdffaf..95c4a82c1460102b2fdb81bac2dd8e33658f7c44 100644
--- a/chrome/browser/banners/app_banner_manager.cc
+++ b/chrome/browser/banners/app_banner_manager.cc
@@ -18,8 +18,14 @@
 
 namespace {
 bool gDisableSecureCheckForTesting = false;
+
+// Used for non-mobile platforms.
+int kMinimumIconSize = 144;

[benwells, 2015/06/02 05:53:35]

Can we use the extension icon constant? At some point (i.e. you can log a TODO
for now) we should insist on whatever the set of icons is that will guarantee
the best user experience.

[dominickn (DO NOT USE), 2015/06/02 06:51:32]

The extensions code isn't compiled on Android, so this will either need compile
guards or an AppBannerManagerDesktop.

+
 }  // anonymous namespace
 
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(banners::AppBannerManager);
+
 namespace banners {
 
 bool AppBannerManager::URLsAreForTheSamePage(const GURL& first,
@@ -34,6 +40,13 @@ AppBannerManager::AppBannerManager(int icon_size)
       weak_factory_(this) {
 }
 
+AppBannerManager::AppBannerManager(content::WebContents* web_contents)
+    : content::WebContentsObserver(web_contents),
+      ideal_icon_size_(kMinimumIconSize),
+      data_fetcher_(nullptr),
+      weak_factory_(this) {
+}
+
 AppBannerManager::~AppBannerManager() {
   CancelActiveFetcher();
 }
@@ -63,7 +76,6 @@ void AppBannerManager::DidFinishLoad(
   data_fetcher_->Start(validated_url);
 }
 
-
 bool AppBannerManager::HandleNonWebApp(const std::string& platform,
                                        const GURL& url,
                                        const std::string& id) {