remove align16 calls in skhader context sizes. will handle this elsewhere as needed

src/core/SkComposeShader.cpp

Index: src/core/SkComposeShader.cpp
diff --git a/src/core/SkComposeShader.cpp b/src/core/SkComposeShader.cpp
index e4ad6e9edab9099197a5b268b9446e6759b48d14..b6ba3729d1ba641b936d55d85f57811ace7e6fc5 100644
--- a/src/core/SkComposeShader.cpp
+++ b/src/core/SkComposeShader.cpp
@@ -31,7 +31,7 @@ SkComposeShader::~SkComposeShader() {
 }
 
 size_t SkComposeShader::onContextSize(const ContextRec& rec) const {
-    return SkAlign16(sizeof(ComposeShaderContext))
+    return sizeof(ComposeShaderContext)
         + fShaderA->contextSize(rec)
         + fShaderB->contextSize(rec);
 }
@@ -76,7 +76,7 @@ template <typename T> void safe_call_destructor(T* obj) {
 }
 
 SkShader::Context* SkComposeShader::onCreateContext(const ContextRec& rec, void* storage) const {
-    char* aStorage = (char*) storage + SkAlign16(sizeof(ComposeShaderContext));
+    char* aStorage = (char*) storage + sizeof(ComposeShaderContext);
     char* bStorage = aStorage + fShaderA->contextSize(rec);
 
     // we preconcat our localMatrix (if any) with the device matrix