Expose thumbnails of pages to iOS share extensions.

ios/chrome/browser/ui/uikit_ui_util_unittest.mm

 // Copyright 2012 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.
 
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #import "ios/chrome/browser/ui/ui_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 83 matching lines @@
   UIImage* image = testImage(CGSizeMake(100, 50));
   actual = ResizeImage(image, CGSizeZero, ProjectionMode::kAspectFit);
   EXPECT_FALSE(actual);
 
   actual = ResizeImage(image, CGSizeMake(0.1, 0.1), ProjectionMode::kAspectFit);
   EXPECT_FALSE(actual);
 
   actual =
       ResizeImage(image, CGSizeMake(-100, -100), ProjectionMode::kAspectFit);
   EXPECT_FALSE(actual);
+
+  actual = ResizeImage(nil, CGSizeMake(100, 100), ProjectionMode::kAspectFit);
+  EXPECT_FALSE(actual);
 }
 
 TEST(UIKitUIUtilTest, TintImageKeepsImageProperties) {
   UIImage* image = testImage(CGSizeMake(100, 75));
   UIImage* tintedImage = TintImage(image, [UIColor blueColor]);
   EXPECT_EQ(image.size.width, tintedImage.size.width);
   EXPECT_EQ(image.size.height, tintedImage.size.height);
   EXPECT_EQ(image.scale, tintedImage.scale);
   EXPECT_EQ(image.capInsets.top, tintedImage.capInsets.top);
   EXPECT_EQ(image.capInsets.left, tintedImage.capInsets.left);
@@ skipping 39 matching lines @@
   ASSERT_EQ(kCGColorSpaceModelMonochrome,
             CGColorSpaceGetModel(CGColorGetColorSpace(black.CGColor)));
 
   // Interpolate between monochrome and rgb.
   ExpectInterpolatedColor(black, rgb, 0.5, 0.1);
   // Interpolate between two monochrome colors.
   ExpectInterpolatedColor(black, white, 0.3, 0.3);
 }
 
 }  // namespace