Same for me on nouveau:

Graphics Feature Status

Canvas: Software only, hardware acceleration unavailable
Flash: Software only, hardware acceleration unavailable
Flash Stage3D: Software only, hardware acceleration unavailable
Flash Stage3D Baseline profile: Software only, hardware acceleration unavailable
Compositing: Software only, hardware acceleration unavailable
Multiple Raster Threads: Unavailable
Rasterization: Software only, hardware acceleration unavailable
Threaded Rasterization: Unavailable
Video Decode: Software only, hardware acceleration unavailable
Video Encode: Software only, hardware acceleration unavailable
WebGL: Unavailable

Driver Bug Workarounds

clear_uniforms_before_first_program_use
count_all_in_varyings_packing
disable_post_sub_buffers_for_onscreen_surfaces
init_gl_position_in_vertex_shader
init_vertex_attributes
scalarize_vec_and_mat_constructor_args
use_current_program_after_successful_link

Problems Detected

GPU process was unable to boot: GPU access is disabled in chrome://settings.
Disabled Features: all
Always call glUseProgram after a successful link to avoid a driver bug: 349137
Applied Workarounds: use_current_program_after_successful_link
Program link fails in NVIDIA Linux if gl_Position is not set: 286468
Applied Workarounds: init_gl_position_in_vertex_shader
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Mesa drivers in Linux handle varyings without static use incorrectly: 333885
Applied Workarounds: count_all_in_varyings_packing
Linux NVIDIA drivers don't have the correct defaults for vertex attributes: 351528
Applied Workarounds: init_vertex_attributes
Disable partial swaps on linux drivers: 339493
Applied Workarounds: disable_post_sub_buffers_for_onscreen_surfaces
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args

Version Information

Data exported	6/20/2015, 10:20:04 AM
Chrome version	Chrome/43.0.2357.81
Operating system	Linux 3.19.0-18-generic
Software rendering list version	0
Driver bug list version	8.06
ANGLE commit id	unknown hash
2D graphics backend	Skia
Command Line Args	--enable-strict-site-isolation --ignore-gpu-blacklist --no-default-browser-check --disk-cache-dir=/run/shm/user/chromium --enable-tab-audio-muting --enable-overlay-scrollbar --enable-pinch --flag-switches-begin --ignore-gpu-blacklist --flag-switches-end

Driver Information

Initialization time	0
Sandboxed	false
GPU0	VENDOR = 0x10de, DEVICE= 0x0dfa
Optimus	false
AMD switchable	false
Driver vendor	Mesa
Driver version	10.5.2
Driver date	
Pixel shader version	
Vertex shader version	
Machine model name	
Machine model version	
GL_VENDOR	nouveau
GL_RENDERER	Gallium 0.4 on NVC1
GL_VERSION	3.0 Mesa 10.5.2
GL_EXTENSIONS	
Window system binding vendor	
Window system binding version	
Window system binding extensions	
Window manager	Compiz
XDG_CURRENT_DESKTOP	Unity
GDMSESSION	ubuntu
Compositing manager	Yes
Direct rendering	Yes
Reset notification strategy	0x0000
GPU process crash count	0


Before that everything worked fine. Now watching videos sucks, because of the tearing. Simply put: the browser is unusable for me.

Like comment #12 said: It seems the gpu flag was deliberately disabled by the ubuntu maintainer, a step that renders the browser unusable for me.
Everything worked fine without crashes before for me.