Add support for icons.{src,type,density} in Manifest.

content/public/common/manifest.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_MANIFEST_H_
 #define CONTENT_PUBLIC_COMMON_MANIFEST_H_
 
+#include <vector>
+
 #include "base/strings/nullable_string16.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebScreenOrientationLockType.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // The Manifest structure is an internal representation of the Manifest file
 // described in the "Manifest for Web Application" document:
 // http://w3c.github.io/manifest/
 struct CONTENT_EXPORT Manifest {
   enum DisplayMode {
     DISPLAY_MODE_UNSPECIFIED,
     DISPLAY_MODE_FULLSCREEN,
     DISPLAY_MODE_STANDALONE,
     DISPLAY_MODE_MINIMAL_UI,
     DISPLAY_MODE_BROWSER
   };
 
+  // Structure representing an icon as per the Manifest specification, see:
+  // http://w3c.github.io/manifest/#dfn-icon-object
+  struct CONTENT_EXPORT Icon {
+    Icon();
+    ~Icon();
+
+    // MUST be a valid url. If an icon doesn't have a valid URL, it will not be
+    // successfully parsed, thus will not be represented in the Manifest.
+    GURL src;
+
+    // Null if the parsing failed or the field was not present. The type can be
+    // any string and doesn't have to be a valid image MIME type at this point.
+    // It is up to the consumer of the object to check if the type matches a
+    // supported type.
+    base::NullableString16 type;
+
+    // Default value is 1.0 if the value is missing or invalid.
+    double density;
+
+    // Default density. Set to 1.0.
+    static const double kDefaultDensity;
+  };
+
   Manifest();
   ~Manifest();
 
   // Returns whether this Manifest had no attribute set. A newly created
   // Manifest is always empty.
   bool IsEmpty() const;
 
   // Null if the parsing failed or the field was not present.
   base::NullableString16 name;
 
   // Null if the parsing failed or the field was not present.
   base::NullableString16 short_name;
 
   // Empty if the parsing failed or the field was not present.
   GURL start_url;
 
   // Set to DISPLAY_MODE_UNSPECIFIED if the parsing failed or the field was not
   // present.
   DisplayMode display;
 
   // Set to blink::WebScreenOrientationLockDefault if the parsing failed or the
   // field was not present.
   blink::WebScreenOrientationLockType orientation;
 
+  // Empty if the parsing failed, the field was not present, empty or all the
+  // icons inside the JSON array were invalid.
+  std::vector<Icon> icons;
+
   // Maximum length for all the strings inside the Manifest when it is sent over
   // IPC. The renderer process should truncate the strings before sending the
   // Manifest and the browser process must do the same when receiving it.
   static const size_t kMaxIPCStringLength;
 };
 
 } // namespace content
 
 #endif // CONTENT_PUBLIC_COMMON_MANIFEST_H_