Make GrDrawTarget::Caps ref counted and GrGLCaps derive from it.

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
===================================================================
--- src/gpu/GrContext.cpp	(revision 8359)
+++ src/gpu/GrContext.cpp	(working copy)
@@ -548,15 +548,15 @@
 }
 
 int GrContext::getMaxTextureSize() const {
-    return fGpu->getCaps().maxTextureSize();
+    return fGpu->caps()->maxTextureSize();
 }
 
 int GrContext::getMaxRenderTargetSize() const {
-    return fGpu->getCaps().maxRenderTargetSize();
+    return fGpu->caps()->maxRenderTargetSize();
 }
 
 int GrContext::getMaxSampleCount() const {
-    return fGpu->getCaps().maxSampleCount();
+    return fGpu->caps()->maxSampleCount();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -573,8 +573,8 @@
 
 bool GrContext::supportsIndex8PixelConfig(const GrTextureParams* params,
                                           int width, int height) const {
-    const GrDrawTarget::Caps& caps = fGpu->getCaps();
-    if (!caps.eightBitPaletteSupport()) {
+    const GrDrawTarget::Caps* caps = fGpu->caps();
+    if (!caps->eightBitPaletteSupport()) {
         return false;
     }
 
@@ -582,7 +582,7 @@
 
     if (!isPow2) {
         bool tiled = NULL != params && params->isTiled();
-        if (tiled && !caps.npotTextureTileSupport()) {
+        if (tiled && !caps->npotTextureTileSupport()) {
             return false;
         }
     }