Adding more validation

- Added a way to check that the number of inputs of a filter is not more than a filter expects
- Added validation of reftype in SkBitmap::unflatten()
- Added validation on fKD (diffuse lighting constant) and fKS (specular lighting constant) to make sure that they are always non-negative numbers
- Added validation of SkPerlinNoiseShader::fType and SkPerlinNoiseShader::fNumOctaves

BUG=
R=reed@google.com, senorblanco@google.com, mtklein@google.com, senorblanco@chromium.org, sugoi@google.com

Author: sugoi@chromium.org

Review URL: https://codereview.chromium.org/83343003

git-svn-id: http://skia.googlecode.com/svn/trunk/include@12388 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/core/SkImageFilter.h b/core/SkImageFilter.h
index 56ebc2b..1e9f72e 100644
--- a/core/SkImageFilter.h
+++ b/core/SkImageFilter.h
@@ -156,7 +156,7 @@
 
     virtual ~SkImageFilter();
 
-    explicit SkImageFilter(SkFlattenableReadBuffer& rb);
+    explicit SkImageFilter(int maxInputCount, SkFlattenableReadBuffer& rb);
 
     virtual void flatten(SkFlattenableWriteBuffer& wb) const SK_OVERRIDE;