Add support to process favicons from Web Manifests

components/favicon/content/content_favicon_driver.cc

Index: components/favicon/content/content_favicon_driver.cc
diff --git a/components/favicon/content/content_favicon_driver.cc b/components/favicon/content/content_favicon_driver.cc
index d6bbcac5d8f4465732789f634c9778e2e8779099..1d7ce4c80d3507ca7f62fa9371f797797bdffaba 100644
--- a/components/favicon/content/content_favicon_driver.cc
+++ b/components/favicon/content/content_favicon_driver.cc
@@ -16,11 +16,39 @@
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/common/favicon_url.h"
+#include "content/public/common/manifest.h"
 #include "ui/gfx/image/image.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(favicon::ContentFaviconDriver);
 
 namespace favicon {
+namespace {
+
+// TODO / DONOTSUBMIT: Only for prototyping purposes.
+void ExtractManifestURL(
+    const base::Callback<void(const base::Optional<GURL>&)>& callback,
+    const GURL& manifest_url,
+    const content::Manifest& manifest) {
+  if (manifest_url.is_empty())
+    callback.Run(base::nullopt);
+  else
+    callback.Run(manifest_url);
+}
+
+void ExtractManifestIcons(
+    ContentFaviconDriver::ManifestDownloadCallback callback,
+    const GURL& manifest_url,
+    const content::Manifest& manifest) {
+  // TODO/DONOTSUBMIT(mastiz): This should distinguish 404s from other status
+  // codes.
+  std::vector<FaviconURL> candidates;
+  for (const content::Manifest::Icon& icon : manifest.icons) {
+    candidates.emplace_back(icon.src, favicon_base::FAVICON, icon.sizes);
+  }
+  callback.Run(/*status_code=*/200, candidates);
+}
+
+}  // namespace
 
 // static
 void ContentFaviconDriver::CreateForWebContents(
@@ -112,10 +140,17 @@ int ContentFaviconDriver::DownloadImage(const GURL& url,
   bool bypass_cache = (bypass_cache_page_url_ == GetActiveURL());
   bypass_cache_page_url_ = GURL();
 
+  LOG(INFO) << "MIKEL Downloading image " << url;
+
   return web_contents()->DownloadImage(url, true, max_image_size, bypass_cache,
                                        callback);
 }
 
+void ContentFaviconDriver::DownloadManifest(const GURL& url,
+                                            ManifestDownloadCallback callback) {
+  web_contents()->GetManifest(base::Bind(&ExtractManifestIcons, callback));
+}
+
 bool ContentFaviconDriver::IsOffTheRecord() {
   DCHECK(web_contents());
   return web_contents()->GetBrowserContext()->IsOffTheRecord();
@@ -144,6 +179,7 @@ void ContentFaviconDriver::OnFaviconUpdated(
 
 void ContentFaviconDriver::DidUpdateFaviconURL(
     const std::vector<content::FaviconURL>& candidates) {
+  LOG(INFO) << "MIKEL DidUpdateFaviconURL() " << candidates.size();
   DCHECK(!candidates.empty());
 
   // Ignore the update if there is no last committed navigation entry. This can
@@ -154,8 +190,33 @@ void ContentFaviconDriver::DidUpdateFaviconURL(
     return;
 
   favicon_urls_ = candidates;
-  OnUpdateFaviconURL(entry->GetURL(),
-                     FaviconURLsFromContentFaviconURLs(candidates));
+
+  // On regular page loads, DidUpdateManifestURL() is guaranteed to be called
+  // after DidUpdateFaviconURL(). However, a page can update the favicons via
+  // javascript.
+  if (received_manifest_url_) {
+    OnUpdateCandidates(entry->GetURL(),
+                       FaviconURLsFromContentFaviconURLs(favicon_urls_),
+                       manifest_url_);
+  }
+}
+
+void ContentFaviconDriver::DidUpdateManifestURL(
+    const base::Optional<GURL>& manifest_url) {
+  LOG(INFO) << "MIKEL DidUpdateManifestURL() " << manifest_url.value_or(GURL());
+  // Ignore the update if there is no last committed navigation entry. This can
+  // occur when loading an initially blank page.
+  content::NavigationEntry* entry =
+      web_contents()->GetController().GetLastCommittedEntry();
+  if (!entry)
+    return;
+
+  received_manifest_url_ = true;
+  manifest_url_ = manifest_url;
+
+  OnUpdateCandidates(entry->GetURL(),
+                     FaviconURLsFromContentFaviconURLs(favicon_urls_),
+                     manifest_url);
 }
 
 void ContentFaviconDriver::DidStartNavigation(
@@ -163,6 +224,10 @@ void ContentFaviconDriver::DidStartNavigation(
   if (!navigation_handle->IsInMainFrame())
     return;
 
+  favicon_urls_.clear();
+  received_manifest_url_ = false;
+  manifest_url_.reset();
+
   content::ReloadType reload_type = navigation_handle->GetReloadType();
   if (reload_type == content::ReloadType::NONE || IsOffTheRecord())
     return;
@@ -181,7 +246,13 @@ void ContentFaviconDriver::DidFinishNavigation(
     return;
   }
 
-  favicon_urls_.clear();
+  /////////////////////////////
+  // DONOTSUBMIT / TODO: This hack is here to make the prototype work.
+  base::Callback<void(const base::Optional<GURL>&)> cb =
+      base::Bind(&ContentFaviconDriver::DidUpdateManifestURL,
+                 base::Unretained(this));
+  web_contents()->GetManifest(base::Bind(&ExtractManifestURL, cb));
+  /////////////////////////////
 
   // Wait till the user navigates to a new URL to start checking the cache
   // again. The cache may be ignored for non-reload navigations (e.g.