ios fixes

skia_ios.mm
Get the app's Documents directory and pass use it to set the resource path.
This is a quick hack which will be replaced by a new application that is
a tiny shim around a command line tool.

SkImageEncoder.h
SkForceLinking.cpp
SkImageDecoder_CG.cpp
Add support for FORCE_LINKING so iOS sees the PNG encoder and others.

SkFloatBits.cpp
SkPoint.cpp
Handle denormalized numbers that are floored by the iOS ARM processor.

SkImageDecoder_iOS.mm
Remove empty encoder factory.

SkTouchGesture.cpp
Return early on empty state on touch rather than aborting (crashing)

JpegTest.cpp
Hal via stackoverflow.com says partial jpegs can be gray as well.

skia_test.cpp
Remove crash handler call for now to avoid link failure.

OverwriteLine.h
Remove fancy line overwrite for iOS.

Resources.cpp
Add interface to set resource directory based on runtime query.

BUG=skia:2736 skia:2737 skia:2738
R=reed@google.com, halcanary@google.com, mtklein@google.com, tfarina@chromium.org

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/373383003
diff --git a/tools/iOSShell.h b/tools/iOSShell.h
new file mode 100644
index 0000000..7473e01
--- /dev/null
+++ b/tools/iOSShell.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2014 Skia
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef iOSShell_DEFINED
+#define iOSShell_DEFINED
+
+#include "SkWindow.h"
+
+class SkCanvas;
+class SkEvent;
+class SkViewFactory;
+
+class ShellWindow : public SkOSWindow {
+public:
+    ShellWindow(void* hwnd, int argc, char** argv);
+    virtual ~ShellWindow();
+
+    virtual SkCanvas* createCanvas() SK_OVERRIDE {
+        SkCanvas* canvas = this->INHERITED::createCanvas();
+        return canvas;
+    }
+
+protected:
+    virtual void onSizeChange() SK_OVERRIDE;
+
+    virtual bool onDispatchClick(int x, int y, Click::State, void* owner,
+                                 unsigned modi) SK_OVERRIDE;
+
+private:
+    typedef SkOSWindow INHERITED;
+};
+
+#endif