Initialize our quads to zero before we gl_->BufferData() with them.

cc/output/dynamic_geometry_binding.cc

Index: cc/output/dynamic_geometry_binding.cc
diff --git a/cc/output/dynamic_geometry_binding.cc b/cc/output/dynamic_geometry_binding.cc
index 8eeff0c6b4a80e7339dd8f491c3a84dd9c027d10..993e3d0ef46c38a1893b9aea2a32f1174534d496 100644
--- a/cc/output/dynamic_geometry_binding.cc
+++ b/cc/output/dynamic_geometry_binding.cc
@@ -12,8 +12,8 @@ namespace cc {
 
 DynamicGeometryBinding::DynamicGeometryBinding(gpu::gles2::GLES2Interface* gl)
     : gl_(gl), quad_vertices_vbo_(0), quad_elements_vbo_(0) {
-  GeometryBindingQuad quads[8];
-  GeometryBindingQuadIndex quad_indices[8];
+  GeometryBindingQuad quads[1];
+  GeometryBindingQuadIndex quad_indices[1];
 
   static_assert(sizeof(GeometryBindingQuad) == 24 * sizeof(float),
                 "struct Quad should be densely packed");
@@ -50,12 +50,12 @@ void DynamicGeometryBinding::InitializeCustomQuadWithUVs(const gfx::QuadF& quad,
       {quad.p4().x(), quad.p4().y(), 0.0f}, {uv[6], uv[7]}, 3.0f};
 
   GeometryBindingQuad local_quad = {v0, v1, v2, v3};
-  GeometryBindingQuadIndex quad_index = {{static_cast<uint16>(0),
-                                          static_cast<uint16>(1),
-                                          static_cast<uint16>(2),
-                                          static_cast<uint16>(3),
-                                          static_cast<uint16>(0),
-                                          static_cast<uint16>(2)}};
+  GeometryBindingQuadIndex quad_index = {static_cast<uint16>(0),
+                                         static_cast<uint16>(1),
+                                         static_cast<uint16>(2),
+                                         static_cast<uint16>(3),
+                                         static_cast<uint16>(0),
+                                         static_cast<uint16>(2)};
 
   GLC(gl_, gl_->BufferSubData(GL_ARRAY_BUFFER, 0, sizeof(GeometryBindingQuad),
                               &local_quad));