cc: Allow TEXTURE_RECTANGLE_ARB to be used for tile textures.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 6f267cc51b0417ac65f35299e15a4be158db4da9..9485c72ee1369bae2ceffb45c9b02876400d6a35 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -56,6 +56,7 @@
 #include "cc/trees/quad_culler.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "cc/trees/tree_synchronizer.h"
+#include "gpu/GLES2/gl2extchromium.h"
 #include "ui/gfx/frame_time.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/vector2d_conversions.h"
@@ -103,6 +104,22 @@ size_t GetMaxRasterTasksUsageBytes(cc::ContextProvider* context_provider) {
   return GetMaxTransferBufferUsageBytes(context_provider);
 }
 
+GLenum GetMapImageTextureTarget(cc::ContextProvider* context_provider) {
+  if (!context_provider)
+    return GL_TEXTURE_2D;
+
+  // TODO(reveman): Determine if GL_TEXTURE_EXTERNAL_OES works well on
+  // Android before we enable this. crbug.com/322780
+#if !defined(OS_ANDROID)
+  if (context_provider->ContextCapabilities().egl_image_external)
+    return GL_TEXTURE_EXTERNAL_OES;
+  if (context_provider->ContextCapabilities().texture_rectangle)
+    return GL_TEXTURE_RECTANGLE_ARB;
+#endif
+
+  return GL_TEXTURE_2D;
+}
+
 }  // namespace
 
 namespace cc {
@@ -1660,7 +1677,8 @@ void LayerTreeHostImpl::CreateAndSetTileManager(
                           rendering_stats_instrumentation_,
                           using_map_image,
                           GetMaxTransferBufferUsageBytes(context_provider),
-                          GetMaxRasterTasksUsageBytes(context_provider));
+                          GetMaxRasterTasksUsageBytes(context_provider),
+                          GetMapImageTextureTarget(context_provider));
 
   UpdateTileManagerMemoryPolicy(ActualManagedMemoryPolicy());
   need_to_update_visible_tiles_before_draw_ = false;