[Material][Mac] Replace the default favicon with a vector

chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm

 // Copyright (c) 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.
 
 #include "chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.h"
 
+#import <Cocoa/Cocoa.h>
+
+#include "base/mac/scoped_nsobject.h"
 #include "components/favicon/content/content_favicon_driver.h"
+#include "skia/ext/skia_utils_mac.h"
+#include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/resources/grit/ui_resources.h"
 
+namespace {
+
+const CGFloat kVectorIconSize = 16;
+
+}  // namespace
+
+// A temporary class that draws the default favicon using vector commands.
+// This class will be removed once a more general solution that works for all
+// platforms is developed.
+@interface DefaultFaviconImageRep : NSCustomImageRep
+@property(retain, nonatomic) NSColor* strokeColor;
+
++ (NSImage*)imageForColor:(SkColor)strokeColor;
+
+// NSCustomImageRep delegate method that performs the drawing.
++ (void)drawDefaultFavicon:(DefaultFaviconImageRep*)imageRep;
+
+@end
+
+@implementation DefaultFaviconImageRep
+
+@synthesize strokeColor = strokeColor_;
+
+- (void)dealloc {
+  [strokeColor_ release];
+  [super dealloc];
+}
+
++ (NSImage*)imageForColor:(SkColor)strokeColor {
+  base::scoped_nsobject<DefaultFaviconImageRep> imageRep(
+      [[DefaultFaviconImageRep alloc]
+          initWithDrawSelector:@selector(drawDefaultFavicon:)
+                      delegate:[DefaultFaviconImageRep class]]);
+  [imageRep setStrokeColor:skia::SkColorToSRGBNSColor(strokeColor)];
+
+  // Create the image from the image rep.
+  const NSSize imageSize = NSMakeSize(kVectorIconSize, kVectorIconSize);
+  NSImage* faviconImage =
+      [[[NSImage alloc] initWithSize:imageSize] autorelease];
+  [faviconImage setCacheMode:NSImageCacheAlways];
+  [faviconImage addRepresentation:imageRep];
+
+  [imageRep setSize:imageSize];
+
+  return faviconImage;
+}
+
++ (void)drawDefaultFavicon:(DefaultFaviconImageRep*)imageRep {
+  // Translate by 1/2pt to ensure crisp lines.
+  CGContextRef context = static_cast<CGContextRef>(
+      [[NSGraphicsContext currentContext] graphicsPort]);
+  CGContextTranslateCTM(context, 0.5, 0.5);
+
+  NSBezierPath* iconPath = [NSBezierPath bezierPath];
+
+  // Create the horizontal and vertical parts of the shape.
+  [iconPath moveToPoint:NSMakePoint(3, 1)];
+  [iconPath relativeLineToPoint:NSMakePoint(0, 13)];
+  [iconPath relativeLineToPoint:NSMakePoint(5, 0)];
+  [iconPath relativeLineToPoint:NSMakePoint(0, -4)];
+  [iconPath relativeLineToPoint:NSMakePoint(4, 0)];
+  [iconPath relativeLineToPoint:NSMakePoint(0, -9)];
+  [iconPath closePath];
+
+  // Add the diagonal line.
+  [iconPath moveToPoint:NSMakePoint(8, 14)];
+  [iconPath relativeLineToPoint:NSMakePoint(4, -4)];
+
+  // Draw it in the desired color.
+  [[imageRep strokeColor] set];
+  [iconPath stroke];
+}
+
+@end
+
 namespace mac {
 
-NSImage* FaviconForWebContents(content::WebContents* contents) {
+NSImage* FaviconForWebContents(content::WebContents* contents, SkColor color) {
   favicon::FaviconDriver* favicon_driver =
       contents ? favicon::ContentFaviconDriver::FromWebContents(contents)
                : nullptr;
   if (favicon_driver && favicon_driver->FaviconIsValid()) {
     NSImage* image = favicon_driver->GetFavicon().AsNSImage();
     // The |image| could be nil if the bitmap is null. In that case, fallback
     // to the default image.
     if (image) {
       return image;
     }
   }
 
+  if (ui::MaterialDesignController::IsModeMaterial())
+    return [DefaultFaviconImageRep imageForColor:color];
+
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   return rb.GetNativeImageNamed(IDR_DEFAULT_FAVICON).ToNSImage();
 }
 
 }  // namespace mac