Reviewed by Sam Weinig.

        Rename BackingStore to ShareableBitmap
        https://bugs.webkit.org/show_bug.cgi?id=52228

        * GNUmakefile.am:
        * PluginProcess/PluginControllerProxy.cpp:
        (WebKit::PluginControllerProxy::geometryDidChange):
        * PluginProcess/PluginControllerProxy.h:
        * Shared/API/c/cg/WKImageCG.cpp:
        (WKImageCreateCGImage):
        * Shared/BackingStore.cpp: Removed.
        * Shared/BackingStore.h: Removed.
        * Shared/PlatformPopupMenuData.cpp:
        (WebKit::PlatformPopupMenuData::decode):
        * Shared/PlatformPopupMenuData.h:
        * Shared/ShareableBitmap.cpp: Copied from WebKit2/Shared/BackingStore.cpp.
        (WebKit::ShareableBitmap::create):
        (WebKit::ShareableBitmap::createSharable):
        (WebKit::ShareableBitmap::createHandle):
        (WebKit::ShareableBitmap::ShareableBitmap):
        (WebKit::ShareableBitmap::~ShareableBitmap):
        (WebKit::ShareableBitmap::resize):
        (WebKit::ShareableBitmap::data):
        * Shared/ShareableBitmap.h: Copied from WebKit2/Shared/BackingStore.h.
        * Shared/UserMessageCoders.h:
        (WebKit::UserMessageEncoder::baseEncode):
        (WebKit::UserMessageDecoder::baseDecode):
        * Shared/WebImage.cpp:
        (WebKit::WebImage::create):
        (WebKit::WebImage::WebImage):
        (WebKit::WebImage::~WebImage):
        (WebKit::WebImage::size):
        * Shared/WebImage.h:
        (WebKit::WebImage::bitmap):
        * Shared/cairo/BackingStoreCairo.cpp:
        (WebKit::ShareableBitmap::createGraphicsContext):
        (WebKit::ShareableBitmap::paint):
        * Shared/cg/BackingStoreCG.cpp: Removed.
        * Shared/cg/ShareableBitmapCG.cpp: Copied from WebKit2/Shared/cg/BackingStoreCG.cpp.
        (WebKit::ShareableBitmap::createGraphicsContext):
        (WebKit::ShareableBitmap::paint):
        * Shared/gtk/BackingStoreGtk.cpp: Removed.
        * Shared/gtk/ShareableBitmapGtk.cpp: Copied from WebKit2/Shared/gtk/BackingStoreGtk.cpp.
        (WebKit::ShareableBitmap::createGraphicsContext):
        (WebKit::ShareableBitmap::paint):
        * Shared/qt/BackingStoreQt.cpp: Removed.
        * Shared/qt/ShareableBitmapQt.cpp: Copied from WebKit2/Shared/qt/BackingStoreQt.cpp.
        (WebKit::ShareableBitmap::createGraphicsContext):
        (WebKit::ShareableBitmap::paint):
        * UIProcess/FindIndicator.cpp:
        (WebKit::FindIndicator::create):
        (WebKit::FindIndicator::FindIndicator):
        * UIProcess/FindIndicator.h:
        (WebKit::FindIndicator::contentImage):
        * WebKit2.pro:
        * WebKit2.xcodeproj/project.pbxproj:
        * WebProcess/Plugins/PluginProxy.cpp:
        (WebKit::PluginProxy::geometryDidChange):
        * WebProcess/Plugins/PluginProxy.h:
        * WebProcess/WebPage/FindController.cpp:
        (WebKit::FindController::updateFindIndicator):
        * WebProcess/WebPage/WebPage.cpp:
        (WebKit::WebPage::snapshotInViewCoordinates):
        (WebKit::WebPage::snapshotInDocumentCoordinates):
        * win/WebKit2.vcproj:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75527 268f45cc-cd09-0410-ab3c-d52691b4dbfc