Bug 718440. Add more sampler labels to various places. r=bgirard

content/base/src/nsXMLHttpRequest.cpp

gfx/gl/GLContextProviderCGL.mm

gfx/layers/opengl/LayerManagerOGL.cpp

image/src/imgFrame.cpp

layout/base/nsLayoutUtils.cpp

layout/generic/nsObjectFrame.cpp

netwerk/base/src/nsInputStreamPump.cpp

netwerk/base/src/nsStreamLoader.cpp

netwerk/protocol/http/nsHttpChannel.cpp

parser/html/nsHtml5TreeOpExecutor.cpp

storage/src/mozStorageConnection.cpp

storage/src/mozStorageStatement.cpp

toolkit/components/places/nsAnnotationService.cpp

toolkit/components/places/nsNavBookmarks.cpp

tools/profiler/sampler.h

tools/profiler/sps/sps_sampler.h

view/src/nsViewManager.cpp

widget/cocoa/nsAppShell.mm

widget/cocoa/nsChildView.mm