SvgLoader: Implement ClipPath style

SvgLoader: Implement ClipPath style

Supports case of using style attribute for defined <clipPath>.
In SVG, <clipPath> can be used as a "clipPath" attribute or a style "clip-path".
This patch only supports "clip-path" of style is declared.
The remaining features will be added later.

[Example SVG case]

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 viewBox="0 0 64 64" enable-background="new 0 0 64 64" xml:space="preserve">
 <defs>
      <clipPath id="clipPath">
          <rect x="15" y="15" width="40" height="40" fill="#F00" />
          <circle cx="20" cy="20" r="10" fill="#F00" />
      </clipPath>
  </defs>

  <circle cx="25" cy="25" r="20"
          style="fill: #0000ff; clip-path: url(#clipPath); " />
</svg>

Change-Id: Ie9b1000a52070ca86f67ce794413c3640784a079