Rename GPUAccelData to GrAccelData

This is calved off of (Add new API to allow layer hoisting/atlasing across picture piles
- https://codereview.chromium.org/474623002/)

R=bsalomon@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/482773002
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 64439a1..f2bd025 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1854,14 +1854,14 @@
         return;
     }
 
-    SkPicture::AccelData::Key key = GPUAccelData::ComputeAccelDataKey();
+    SkPicture::AccelData::Key key = GrAccelData::ComputeAccelDataKey();
 
     const SkPicture::AccelData* existing = picture->EXPERIMENTAL_getAccelData(key);
     if (NULL != existing) {
         return;
     }
 
-    SkAutoTUnref<GPUAccelData> data(SkNEW_ARGS(GPUAccelData, (key)));
+    SkAutoTUnref<GrAccelData> data(SkNEW_ARGS(GrAccelData, (key)));
 
     picture->EXPERIMENTAL_addAccelData(data);
 
@@ -1885,14 +1885,14 @@
 
     fContext->getLayerCache()->processDeletedPictures();
 
-    SkPicture::AccelData::Key key = GPUAccelData::ComputeAccelDataKey();
+    SkPicture::AccelData::Key key = GrAccelData::ComputeAccelDataKey();
 
     const SkPicture::AccelData* data = picture->EXPERIMENTAL_getAccelData(key);
     if (NULL == data) {
         return false;
     }
 
-    const GPUAccelData *gpuData = static_cast<const GPUAccelData*>(data);
+    const GrAccelData *gpuData = static_cast<const GrAccelData*>(data);
 
     if (0 == gpuData->numSaveLayers()) {
         return false;
@@ -1925,11 +1925,11 @@
         for (int i = 0; i < ops->numOps(); ++i) {
             uint32_t offset = ops->offset(i);
 
-            // For now we're saving all the layers in the GPUAccelData so they
+            // For now we're saving all the layers in the GrAccelData so they
             // can be nested. Additionally, the nested layers appear before
             // their parent in the list.
             for (int j = 0 ; j < gpuData->numSaveLayers(); ++j) {
-                const GPUAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(j);
+                const GrAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(j);
 
                 if (pullForward[j]) {
                     continue;            // already pulling forward
@@ -1955,7 +1955,7 @@
         // In this case there is no BBH associated with the picture. Pre-render
         // all the layers that intersect the drawn region
         for (int j = 0; j < gpuData->numSaveLayers(); ++j) {
-            const GPUAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(j);
+            const GrAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(j);
 
             SkIRect layerRect = SkIRect::MakeXYWH(info.fOffset.fX,
                                                   info.fOffset.fY,
@@ -1987,7 +1987,7 @@
     // Generate the layer and/or ensure it is locked
     for (int i = 0; i < gpuData->numSaveLayers(); ++i) {
         if (pullForward[i]) {
-            const GPUAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(i);
+            const GrAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(i);
 
             GrCachedLayer* layer = fContext->getLayerCache()->findLayerOrCreate(picture->uniqueID(), 
                                                                                 info.fSaveLayerOpID, 
@@ -2125,7 +2125,7 @@
 
     // unlock the layers
     for (int i = 0; i < gpuData->numSaveLayers(); ++i) {
-        const GPUAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(i);
+        const GrAccelData::SaveLayerInfo& info = gpuData->saveLayerInfo(i);
 
         GrCachedLayer* layer = fContext->getLayerCache()->findLayer(picture->uniqueID(), 
                                                                     info.fSaveLayerOpID,