Expose thumbnails of pages to iOS share extensions.

ios/chrome/browser/ui/ui_util.mm

 // Copyright 2013 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.
 
 #include "ios/chrome/browser/ui/ui_util.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/logging.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
@@ skipping 92 matching lines @@
 
   CGFloat aspectRatio = originalSize.width / originalSize.height;
   CGFloat targetAspectRatio = targetSize.width / targetSize.height;
   switch (projectionMode) {
     case ProjectionMode::kFill:
       // Don't preserve the aspect ratio.
       projectTo.size = targetSize;
       break;
 
     case ProjectionMode::kAspectFill:
+    case ProjectionMode::kAspectFillAlignTop:
       if (targetAspectRatio < aspectRatio) {
         // Clip the x-axis.
         projectTo.size.width = targetSize.height * aspectRatio;
         projectTo.size.height = targetSize.height;
         projectTo.origin.x = (targetSize.width - projectTo.size.width) / 2;
         projectTo.origin.y = 0;
       } else {
         // Clip the y-axis.
         projectTo.size.width = targetSize.width;
         projectTo.size.height = targetSize.width / aspectRatio;
         projectTo.origin.x = 0;
         projectTo.origin.y = (targetSize.height - projectTo.size.height) / 2;
       }
+      if (projectionMode == ProjectionMode::kAspectFillAlignTop) {
+        projectTo.origin.y = 0;
+      }
       break;
 
     case ProjectionMode::kAspectFit:
       if (targetAspectRatio < aspectRatio) {
         projectTo.size.width = targetSize.width;
         projectTo.size.height = projectTo.size.width / aspectRatio;
         targetSize = projectTo.size;
       } else {
         projectTo.size.height = targetSize.height;
         projectTo.size.width = projectTo.size.height * aspectRatio;
@@ skipping 12 matching lines @@
       projectTo.size = targetSize;
       break;
   }
 
   projectTo = CGRectIntegral(projectTo);
   // There's no CGSizeIntegral, faking one instead.
   CGRect integralRect = CGRectZero;
   integralRect.size = targetSize;
   targetSize = CGRectIntegral(integralRect).size;
 }