Use uint16s for texture coordinates when rendering text.

src/gpu/GrFontCache.cpp

Index: src/gpu/GrFontCache.cpp
diff --git a/src/gpu/GrFontCache.cpp b/src/gpu/GrFontCache.cpp
index 3e83e6c950ba6927699b17e462f9f4fde33ef35d..2bc5567c19c5d74ea333b1a64b4b397f7268a8a3 100644
--- a/src/gpu/GrFontCache.cpp
+++ b/src/gpu/GrFontCache.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "GrFontCache.h"
+#include "GrFontAtlasSizes.h"
 #include "GrGpu.h"
 #include "GrRectanizer.h"
 #include "GrSurfacePriv.h"
@@ -15,15 +16,6 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
-#define GR_ATLAS_TEXTURE_WIDTH 1024
-#define GR_ATLAS_TEXTURE_HEIGHT 2048
-
-#define GR_PLOT_WIDTH  256
-#define GR_PLOT_HEIGHT 256
-
-#define GR_NUM_PLOTS_X   (GR_ATLAS_TEXTURE_WIDTH / GR_PLOT_WIDTH)
-#define GR_NUM_PLOTS_Y   (GR_ATLAS_TEXTURE_HEIGHT / GR_PLOT_HEIGHT)
-
 #define FONT_CACHE_STATS 0
 #if FONT_CACHE_STATS
 static int g_PurgeCount = 0;
@@ -121,12 +113,12 @@ GrPlot* GrFontCache::addToAtlas(GrMaskFormat format, GrAtlas::ClientPlotUsage* u
     GrPixelConfig config = mask_format_to_pixel_config(format);
     int atlasIndex = mask_format_to_atlas_index(format);
     if (NULL == fAtlases[atlasIndex]) {
-        SkISize textureSize = SkISize::Make(GR_ATLAS_TEXTURE_WIDTH,
-                                            GR_ATLAS_TEXTURE_HEIGHT);
+        SkISize textureSize = SkISize::Make(GR_FONT_ATLAS_TEXTURE_WIDTH,
+                                            GR_FONT_ATLAS_TEXTURE_HEIGHT);
         fAtlases[atlasIndex] = SkNEW_ARGS(GrAtlas, (fGpu, config, kNone_GrSurfaceFlags,
                                                     textureSize,
-                                                    GR_NUM_PLOTS_X,
-                                                    GR_NUM_PLOTS_Y,
+                                                    GR_FONT_ATLAS_NUM_PLOTS_X,
+                                                    GR_FONT_ATLAS_NUM_PLOTS_Y,
                                                     true));
     }
     return fAtlases[atlasIndex]->addToAtlas(usage, width, height, image, loc);
@@ -289,10 +281,10 @@ bool GrTextStrike::glyphTooLargeForAtlas(GrGlyph* glyph) {
     int width = glyph->fBounds.width();
     int height = glyph->fBounds.height();
     int pad = fUseDistanceField ? 2 * SK_DistanceFieldPad : 0;
-    if (width + pad > GR_PLOT_WIDTH) {
+    if (width + pad > GR_FONT_ATLAS_PLOT_WIDTH) {
         return true;
     }
-    if (height + pad > GR_PLOT_HEIGHT) {
+    if (height + pad > GR_FONT_ATLAS_PLOT_HEIGHT) {
         return true;
     }