https://bugs.webkit.org/show_bug.cgi?id=105278

Patch by Alexei Filippov <alph@chromium.org> on 2012-12-24
Reviewed by Yury Semikhatsky.

On some platforms (e.g. Linux) it may take some time to collect
total process memory information as it involves an IPC out of a
sandboxed renderer process. So add an async way to collect the statistics.

Source/Platform:

* chromium/public/Platform.h:
(Platform):
(ProcessMemorySizesCallback):
(WebKit::Platform::ProcessMemorySizesCallback::~ProcessMemorySizesCallback):
(WebKit::Platform::requestProcessMemorySizes):

Source/WebCore:

* platform/MemoryUsageSupport.cpp:
(WebCore::MemoryUsageSupport::requestProcessMemorySizes):
(WebCore):
* platform/MemoryUsageSupport.h:
(MemoryUsageSupport):
(ProcessMemorySizesCallback):
(WebCore::MemoryUsageSupport::ProcessMemorySizesCallback::~ProcessMemorySizesCallback):
* platform/chromium/MemoryUsageSupportChromium.cpp:
(WebCore::MemoryUsageSupport::requestProcessMemorySizes):
(WebCore):
* platform/qt/MemoryUsageSupportQt.cpp:
(WebCore::MemoryUsageSupport::requestProcessMemorySizes):
(WebCore):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138450 268f45cc-cd09-0410-ab3c-d52691b4dbfc