Merge 91797 - Add support for download='filename' attribute in anchors.

Merge 91797 - Add support for download='filename' attribute in anchors.
https://bugs.webkit.org/show_bug.cgi?id=64580

Patch by Sadrul Habib Chowdhury <sadrul@chromium.org>; on 2011-07-26
Reviewed by Adam Barth.

Source/WebCore: 

The download attribute allows the author of the hyperlink to cause the
browser to download the linked URL.  The author can also supply a
suggested file name in the attribute value.  This feature is a recent
addition to HTML to better support offline applications that use blob
URLs.  Traditionally, web sites use the HTTP Content-Disposition header
to trigger downloads, but that option isn't available when working
offline.

There is some question about whether we should initiate a download when
we receive a DOM-created click event.  This patch does initiate the
download, but we might revise that decision in the future as part of a
larger change in how WebKit treats the interaction between default
event handlers and DOM-created events.

Tests: fast/dom/HTMLAnchorElement/anchor-download.html
       fast/dom/HTMLAnchorElement/anchor-nodownload.html
       fast/dom/HTMLAnchorElement/anchor-download-unset.html
       fast/dom/HTMLAnchorElement/anchor-nodownload-set.html

* html/HTMLAnchorElement.cpp:
(WebCore::HTMLAnchorElement::defaultEventHandler):
(WebCore::HTMLAnchorElement::handleClick):
* html/HTMLAnchorElement.h:
* html/HTMLAnchorElement.idl:
* html/HTMLAttributeNames.in:
* loader/EmptyClients.h:
(WebCore::EmptyFrameLoaderClient::startDownload):
* loader/FrameLoaderClient.h:

Source/WebKit/chromium: 

* features.gypi:
* public/WebFrameClient.h:
(WebKit::WebFrameClient::loadURLExternally):
* src/FrameLoaderClientImpl.cpp:
(WebKit::FrameLoaderClientImpl::dispatchDecidePolicyForNavigationAction):
(WebKit::FrameLoaderClientImpl::startDownload):
* src/FrameLoaderClientImpl.h:

Source/WebKit/efl: 

* WebCoreSupport/FrameLoaderClientEfl.cpp:
(WebCore::FrameLoaderClientEfl::startDownload):
* WebCoreSupport/FrameLoaderClientEfl.h:

Source/WebKit/gtk: 

* WebCoreSupport/FrameLoaderClientGtk.cpp:
(WebKit::FrameLoaderClient::startDownload):
* WebCoreSupport/FrameLoaderClientGtk.h:

Source/WebKit/haiku: 

* WebCoreSupport/FrameLoaderClientHaiku.cpp:
(WebCore::FrameLoaderClientHaiku::startDownload):
* WebCoreSupport/FrameLoaderClientHaiku.h:

Source/WebKit/qt: 

* WebCoreSupport/FrameLoaderClientQt.cpp:
(WebCore::FrameLoaderClientQt::startDownload):
* WebCoreSupport/FrameLoaderClientQt.h:

Source/WebKit/win: 

* WebFrame.cpp:
(WebFrame::startDownload):
* WebFrame.h:

Source/WebKit/wince: 

* WebCoreSupport/FrameLoaderClientWinCE.cpp:
(WebKit::FrameLoaderClientWinCE::startDownload):
* WebCoreSupport/FrameLoaderClientWinCE.h:

Source/WebKit/wx: 

* WebKitSupport/FrameLoaderClientWx.cpp:
(WebCore::FrameLoaderClientWx::startDownload):
* WebKitSupport/FrameLoaderClientWx.h:

Source/WebKit2: 

* WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp:
(WebKit::WebFrameLoaderClient::startDownload):
* WebProcess/WebCoreSupport/WebFrameLoaderClient.h:

Tools: 

* DumpRenderTree/chromium/WebViewHost.cpp:
(WebViewHost::loadURLExternally):
* DumpRenderTree/chromium/WebViewHost.h:

LayoutTests: 

* fast/dom/HTMLAnchorElement/anchor-download-expected.txt: Added.
* fast/dom/HTMLAnchorElement/anchor-download.html: Added.
* fast/dom/HTMLAnchorElement/anchor-nodownload-expected.txt: Added.
* fast/dom/HTMLAnchorElement/anchor-nodownload.html: Added.
* fast/dom/HTMLAnchorElement/anchor-download-unset-expected.txt: Added.
* fast/dom/HTMLAnchorElement/anchor-download-unset.html: Added.
* fast/dom/HTMLAnchorElement/anchor-nodownload-set-expected.txt: Added.
* fast/dom/HTMLAnchorElement/anchor-nodownload-set.html: Added.


TBR=abarth@webkit.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=91867