https://bugs.webkit.org/show_bug.cgi?id=50799 Add Memory Sampler to WebKit
        
Reviewed by Geoff Garen.

Add a sampler for printing off process memory statistics.
Export file mode.

* WebCore.exp.in:

WebKit2: <rdar://problem/8649617> Migrate memory tracking from Safari to WebKit
https://bugs.webkit.org/show_bug.cgi?id=50799 Add Memory Sampler to WebKit
        
Reviewed by Geoff Garen.

Add a sampler for printing off process memory statistics.
This tool can track:
                
        WebCore
           - FastMalloc allocations bytes              (in use or committed)
        JavaScriptCore
           - Garbage collector heap bytes              (in use or committed)
           - Stack bytes                               (committed only!)
           - JIT Code bytes                            (committed only!)
        Malloc zones
           - In use bytes for the following zones:
               * Default zone                          (in use or committed)
               * DispCon zone                          (in use or committed)
               * Purgable zone                         (in use or committed)
        Task Info
           - Resident size memory (RSIZE)
        
        Data collected is dumped to a temporary file.
        
Create a sandbox for a temporary file.
* Shared/SandboxExtension.h:
(WebKit::SandboxExtension::createHandleForTemporaryFile):
* Shared/mac/SandboxExtensionMac.mm:
(WebKit::SandboxExtension::createHandleForTemporaryFile):
        
Memory Sampler files
        
* Shared/WebMemorySampler.cpp: Added.
(WebKit::WebMemorySampler::shared):
(WebKit::WebMemorySampler::WebMemorySampler):
(WebKit::WebMemorySampler::start):
(WebKit::WebMemorySampler::initializeTimers):
(WebKit::WebMemorySampler::stop):
(WebKit::WebMemorySampler::isRunning):
(WebKit::WebMemorySampler::initializeTempLogFile):
(WebKit::WebMemorySampler::initializeSandboxedLogFile):
(WebKit::WebMemorySampler::writeHeaders):
(WebKit::WebMemorySampler::sampleTimerFired):
(WebKit::WebMemorySampler::stopTimerFired):
(WebKit::WebMemorySampler::appendCurrentMemoryUsageToFile):
* Shared/WebMemorySampler.h: Added.
* Shared/mac/WebMemorySampler.mac.mm: Added.
(WebKit::WebMemorySampler::sampleSystemMalloc):
(WebKit::WebMemorySampler::sampleProcessCommittedBytes):
(WebKit::WebMemorySampler::processName):
(WebKit::WebMemorySampler::sampleWebKit):
        
API to start and stop UIProcess and WebProcess sampling.
        
* UIProcess/API/C/WKContext.cpp:
(WKContextStartMemorySampler):
(WKContextStopMemorySampler):
* UIProcess/API/C/WKContext.h:
        
Send messages to WebProcess to start and stop memory sampling.
        
* UIProcess/WebContext.cpp:
(WebKit::WebContext::WebContext):
(WebKit::WebContext::processDidFinishLaunching):
(WebKit::WebContext::startMemorySampler):
(WebKit::WebContext::stopMemorySampler):
* UIProcess/WebContext.h:
* WebKit2.xcodeproj/project.pbxproj:
* WebProcess/WebProcess.cpp:
(WebKit::WebProcess::startMemorySampler):
(WebKit::WebProcess::stopMemorySampler):
* WebProcess/WebProcess.h:
* WebProcess/WebProcess.messages.in:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75306 268f45cc-cd09-0410-ab3c-d52691b4dbfc