Track texture memory globally

Also mostly consolidates texture creation

Change-Id: Ifea01303afda531dcec99b8fe2a0f64cf2f24420
diff --git a/libs/hwui/Layer.h b/libs/hwui/Layer.h
index e90f055b..e00ae66 100644
--- a/libs/hwui/Layer.h
+++ b/libs/hwui/Layer.h
@@ -24,6 +24,7 @@
 #include <memory>
 
 #include <GLES2/gl2.h>
+#include <GpuMemoryTracker.h>
 
 #include <ui/Region.h>
 
@@ -54,7 +55,7 @@
 /**
  * A layer has dimensions and is backed by an OpenGL texture or FBO.
  */
-class Layer : public VirtualLightRefBase {
+class Layer : public VirtualLightRefBase, GpuMemoryTracker {
 public:
     enum class Type {
         Texture,
@@ -94,8 +95,8 @@
         regionRect.set(bounds.leftTop().x, bounds.leftTop().y,
                bounds.rightBottom().x, bounds.rightBottom().y);
 
-        const float texX = 1.0f / float(texture.width);
-        const float texY = 1.0f / float(texture.height);
+        const float texX = 1.0f / float(texture.mWidth);
+        const float texY = 1.0f / float(texture.mHeight);
         const float height = layer.getHeight();
         texCoords.set(
                regionRect.left * texX, (height - regionRect.top) * texY,
@@ -112,11 +113,11 @@
     void updateDeferred(RenderNode* renderNode, int left, int top, int right, int bottom);
 
     inline uint32_t getWidth() const {
-        return texture.width;
+        return texture.mWidth;
     }
 
     inline uint32_t getHeight() const {
-        return texture.height;
+        return texture.mHeight;
     }
 
     /**
@@ -131,8 +132,7 @@
     bool resize(const uint32_t width, const uint32_t height);
 
     void setSize(uint32_t width, uint32_t height) {
-        texture.width = width;
-        texture.height = height;
+        texture.updateSize(width, height, texture.format());
     }
 
     ANDROID_API void setPaint(const SkPaint* paint);
@@ -201,7 +201,7 @@
     }
 
     inline GLuint getTextureId() const {
-        return texture.id;
+        return texture.id();
     }
 
     inline Texture& getTexture() {
@@ -263,7 +263,6 @@
     void bindTexture() const;
     void generateTexture();
     void allocateTexture();
-    void deleteTexture();
 
     /**
      * When the caller frees the texture itself, the caller