Merge 92269 - [Chromium] Fix OOP font loading to work on 10.6.6 and above.

Merge 92269 - [Chromium] Fix OOP font loading to work on 10.6.6 and above.
https://bugs.webkit.org/show_bug.cgi?id=65543

In 10.6.6 the function used to get the unique ID for an NSFont in the
renderer was changed so it fails in the sandbox (it now tries to access
the on-disk font file). In order to work around this, we get the font
ID from the browser process.

To speed things up, we introduce 2 levels of caching in WebKit. A font
name cache where we can perform a quick lookup without the need for the
font id and a font id cache which we can only lookup in after getting
the unique ID from the browser process.

Reviewed by Kenneth Russell.

No new tests since this is not readily testable.

Source/WebCore:

* platform/chromium/PlatformBridge.h:
* platform/graphics/chromium/CrossProcessFontLoading.h:
* platform/graphics/chromium/CrossProcessFontLoading.mm:
(WebCore::MemoryActivatedFont::create):
(WebCore::MemoryActivatedFont::MemoryActivatedFont):
(WebCore::MemoryActivatedFont::~MemoryActivatedFont):

Source/WebKit/chromium:

* public/mac/WebSandboxSupport.h: Plumb font ID parameter through.
* src/PlatformBridge.cpp:
(WebCore::PlatformBridge::loadFont): ditto.


TBR=jeremy@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=92840