Use const where possible for drawing parameters

They should never be modified by a Renderer, only read and copied.

Change-Id: I9d8d55dca19115ee9dfeb2bb3f092ba2fb327cd4
diff --git a/libs/hwui/AssetAtlas.cpp b/libs/hwui/AssetAtlas.cpp
index eb8bb9f..fddfe90 100644
--- a/libs/hwui/AssetAtlas.cpp
+++ b/libs/hwui/AssetAtlas.cpp
@@ -74,12 +74,12 @@
 // Entries
 ///////////////////////////////////////////////////////////////////////////////
 
-AssetAtlas::Entry* AssetAtlas::getEntry(SkBitmap* const bitmap) const {
+AssetAtlas::Entry* AssetAtlas::getEntry(const SkBitmap* bitmap) const {
     ssize_t index = mEntries.indexOfKey(bitmap);
     return index >= 0 ? mEntries.valueAt(index) : NULL;
 }
 
-Texture* AssetAtlas::getEntryTexture(SkBitmap* const bitmap) const {
+Texture* AssetAtlas::getEntryTexture(const SkBitmap* bitmap) const {
     ssize_t index = mEntries.indexOfKey(bitmap);
     return index >= 0 ? mEntries.valueAt(index)->texture : NULL;
 }